I have been running OK for some time, but the above message started showing up recently under Status of the Tasks display. So I downloaded BOINC and VirtualBox per http://boinc.berkeley.edu/download.php. Tasks were in normal state for a short time but then went back to "Postponed".

Now, Help -> About BOINC Manager says
Version: 7.4.36 (x64)
which is consistent with the web page information. What should I do next? I have copied the entire Event Log below in case it helps: it confirms that I have the right version of BOINC and VirtualBox FWIW. Thanks.

Charlie


========================= Event Log ==============================

2/17/2015 11:36:14 AM | | cc_config.xml not found - using defaults
2/17/2015 11:36:14 AM | | Starting BOINC client version 7.4.36 for windows_x86_64
2/17/2015 11:36:14 AM | | log flags: file_xfer, sched_ops, task
2/17/2015 11:36:14 AM | | Libraries: libcurl/7.39.0 OpenSSL/1.0.1j zlib/1.2.8
2/17/2015 11:36:14 AM | | Data directory: C:\ProgramData\BOINC
2/17/2015 11:36:14 AM | | Running under account young
2/17/2015 11:36:14 AM | | No usable GPUs found
2/17/2015 11:36:14 AM | | Host name: CY-Dell-Laptop
2/17/2015 11:36:14 AM | | Processor: 2 GenuineIntel Intel(R) Pentium(R) CPU B960 @ 2.20GHz [Family 6 Model 42 Stepping 7]
2/17/2015 11:36:14 AM | | Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss htt tm pni ssse3 cx16 sse4_1 sse4_2 popcnt syscall nx lm tm2 pbe
2/17/2015 11:36:14 AM | | OS: Microsoft Windows 8.1: Core x64 Edition, (06.03.9600.00)
2/17/2015 11:36:14 AM | | Memory: 3.87 GB physical, 6.87 GB virtual
2/17/2015 11:36:14 AM | | Disk: 457.08 GB total, 402.21 GB free
2/17/2015 11:36:14 AM | | Local time is UTC -8 hours
2/17/2015 11:36:14 AM | | VirtualBox version: 4.3.12
2/17/2015 11:36:14 AM | ATLAS@home | URL http://atlasathome.cern.ch/; Computer ID 1064; resource share 100
2/17/2015 11:36:14 AM | | No general preferences found - using defaults
2/17/2015 11:36:14 AM | | Reading preferences override file
2/17/2015 11:36:14 AM | | Preferences:
2/17/2015 11:36:14 AM | | max memory usage when active: 1979.55MB
2/17/2015 11:36:14 AM | | max memory usage when idle: 3563.18MB
2/17/2015 11:36:14 AM | | max disk usage: 398.92GB
2/17/2015 11:36:14 AM | | don't use GPU while active
2/17/2015 11:36:14 AM | | max download rate: 1024000 bytes/sec
2/17/2015 11:36:14 AM | | max upload rate: 1024000 bytes/sec
2/17/2015 11:36:14 AM | | (to change preferences, visit a project web site or select Preferences in the Manager)
2/17/2015 11:36:14 AM | | Not using a proxy
2/17/2015 11:37:12 AM | ATLAS@home | Computation for task MHbMDmFcyhlnDDn7oo6G73TpABFKDmABFKDmh4HKDmABFKDmWPvKNo_0 finished
2/17/2015 11:37:12 AM | ATLAS@home | Output file MHbMDmFcyhlnDDn7oo6G73TpABFKDmABFKDmh4HKDmABFKDmWPvKNo_0_ATLAS_result for task MHbMDmFcyhlnDDn7oo6G73TpABFKDmABFKDmh4HKDmABFKDmWPvKNo_0 absent
2/17/2015 11:38:14 AM | ATLAS@home | Computation for task P9VMDmyFwhlnDDn7oo6G73TpABFKDmABFKDmIwKKDmABFKDmC53exm_0 finished
2/17/2015 11:38:14 AM | ATLAS@home | Output file P9VMDmyFwhlnDDn7oo6G73TpABFKDmABFKDmIwKKDmABFKDmC53exm_0_ATLAS_result for task P9VMDmyFwhlnDDn7oo6G73TpABFKDmABFKDmIwKKDmABFKDmC53exm_0 absent
2/17/2015 11:41:26 AM | ATLAS@home | Sending scheduler request: To fetch work.
2/17/2015 11:41:26 AM | ATLAS@home | Reporting 2 completed tasks
2/17/2015 11:41:26 AM | ATLAS@home | Requesting new tasks for CPU
2/17/2015 11:41:29 AM | ATLAS@home | Scheduler request completed: got 2 new tasks
2/17/2015 11:41:31 AM | ATLAS@home | Started download of 2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n_input.tar.gz
2/17/2015 11:41:31 AM | ATLAS@home | Started download of 2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n_EVNT.01469885._000527.pool.root.1
2/17/2015 11:41:34 AM | ATLAS@home | Finished download of 2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n_input.tar.gz
2/17/2015 11:41:34 AM | ATLAS@home | Started download of rte_2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n.tar.gz
2/17/2015 11:41:36 AM | ATLAS@home | Finished download of rte_2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n.tar.gz
2/17/2015 11:41:36 AM | ATLAS@home | Started download of boinc_job_script.kcaki6
2/17/2015 11:41:37 AM | ATLAS@home | Finished download of boinc_job_script.kcaki6
2/17/2015 11:41:37 AM | ATLAS@home | Started download of t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn_input.tar.gz
2/17/2015 11:41:40 AM | ATLAS@home | Finished download of t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn_input.tar.gz
2/17/2015 11:41:40 AM | ATLAS@home | Started download of t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn_EVNT.01469884._000489.pool.root.1
2/17/2015 11:45:27 AM | ATLAS@home | Finished download of 2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n_EVNT.01469885._000527.pool.root.1
2/17/2015 11:45:27 AM | ATLAS@home | Started download of rte_t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn.tar.gz
2/17/2015 11:45:29 AM | ATLAS@home | Finished download of rte_t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn.tar.gz
2/17/2015 11:45:29 AM | ATLAS@home | Started download of boinc_job_script.eFjA6V
2/17/2015 11:45:29 AM | ATLAS@home | Starting task 2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n_0
2/17/2015 11:45:30 AM | ATLAS@home | Finished download of boinc_job_script.eFjA6V
2/17/2015 11:45:31 AM | ATLAS@home | Finished download of t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn_EVNT.01469884._000489.pool.root.1
2/17/2015 11:46:30 AM | ATLAS@home | Starting task t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn_3
2/17/2015 11:46:36 AM | ATLAS@home | task postponed 86400.000000 sec: Please upgrade BOINC to the latest version.
2/17/2015 11:47:30 AM | ATLAS@home | task postponed 86400.000000 sec: Please upgrade BOINC to the latest version.
2/18/2015 11:47:54 AM | ATLAS@home | Computation for task 2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n_0 finished
2/18/2015 11:47:54 AM | ATLAS@home | Output file 2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n_0_ATLAS_result for task 2OXLDmxbzhlnDDn7oo6G73TpABFKDmABFKDmM3KKDmABFKDmS4he4n_0 absent
2/18/2015 11:48:57 AM | ATLAS@home | Computation for task t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn_3 finished
2/18/2015 11:48:57 AM | ATLAS@home | Output file t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn_3_ATLAS_result for task t2LNDmgdihlnDDn7oo6G73TpABFKDmABFKDmGALKDmABFKDmf9ibUn_3 absent
2/18/2015 11:51:34 AM | ATLAS@home | Sending scheduler request: To fetch work.
2/18/2015 11:51:34 AM | ATLAS@home | Reporting 2 completed tasks
2/18/2015 11:51:34 AM | ATLAS@home | Requesting new tasks for CPU
2/18/2015 11:51:37 AM | ATLAS@home | Scheduler request completed: got 0 new tasks
2/18/2015 11:51:37 AM | ATLAS@home | No tasks sent
2/18/2015 12:02:49 PM | ATLAS@home | Sending scheduler request: To fetch work.
2/18/2015 12:02:49 PM | ATLAS@home | Requesting new tasks for CPU
2/18/2015 12:02:51 PM | ATLAS@home | Scheduler request completed: got 0 new tasks
2/18/2015 12:02:51 PM | ATLAS@home | No tasks sent
2/18/2015 12:15:03 PM | ATLAS@home | Sending scheduler request: To fetch work.
2/18/2015 12:15:03 PM | ATLAS@home | Requesting new tasks for CPU
2/18/2015 12:15:05 PM | ATLAS@home | Scheduler request completed: got 2 new tasks
2/18/2015 12:15:07 PM | ATLAS@home | Started download of hUNNDmXHMilnDDn7oo6G73TpABFKDmABFKDmtcIKDmABFKDmOQ4Tem_input.tar.gz
2/18/2015 12:15:07 PM | ATLAS@home | Started download of hUNNDmXHMilnDDn7oo6G73TpABFKDmABFKDmtcIKDmABFKDmOQ4Tem_EVNT.01469885._000574.pool.root.1
2/18/2015 12:15:10 PM | ATLAS@home | Finished download of hUNNDmXHMilnDDn7oo6G73TpABFKDmABFKDmtcIKDmABFKDmOQ4Tem_input.tar.gz
2/18/2015 12:15:10 PM | ATLAS@home | Started download of rte_hUNNDmXHMilnDDn7oo6G73TpABFKDmABFKDmtcIKDmABFKDmOQ4Tem.tar.gz
2/18/2015 12:15:11 PM | ATLAS@home | Finished download of rte_hUNNDmXHMilnDDn7oo6G73TpABFKDmABFKDmtcIKDmABFKDmOQ4Tem.tar.gz
2/18/2015 12:15:11 PM | ATLAS@home | Started download of boinc_job_script.mUAR6p
2/18/2015 12:15:12 PM | ATLAS@home | Finished download of boinc_job_script.mUAR6p
2/18/2015 12:15:12 PM | ATLAS@home | Started download of 45vLDmaFKilnDDn7oo6G73TpABFKDmABFKDm9UNKDmABFKDmBCqGon_input.tar.gz
2/18/2015 12:15:15 PM | ATLAS@home | Finished download of 45vLDmaFKilnDDn7oo6G73TpABFKDmABFKDm9UNKDmABFKDmBCqGon_input.tar.gz
2/18/2015 12:15:15 PM | ATLAS@home | Started download of 45vLDmaFKilnDDn7oo6G73TpABFKDmABFKDm9UNKDmABFKDmBCqGon_EVNT.01469885._000562.pool.root.1
2/18/2015 12:19:04 PM | ATLAS@home | Finished download of hUNNDmXHMilnDDn7oo6G73TpABFKDmABFKDmtcIKDmABFKDmOQ4Tem_EVNT.01469885._000574.pool.root.1
2/18/2015 12:19:04 PM | ATLAS@home | Started download of rte_45vLDmaFKilnDDn7oo6G73TpABFKDmABFKDm9UNKDmABFKDmBCqGon.tar.gz
2/18/2015 12:19:05 PM | ATLAS@home | Finished download of rte_45vLDmaFKilnDDn7oo6G73TpABFKDmABFKDm9UNKDmABFKDmBCqGon.tar.gz
2/18/2015 12:19:05 PM | ATLAS@home | Started download of boinc_job_script.iSxo8L
2/18/2015 12:19:05 PM | ATLAS@home | Starting task hUNNDmXHMilnDDn7oo6G73TpABFKDmABFKDmtcIKDmABFKDmOQ4Tem_0
2/18/2015 12:19:07 PM | ATLAS@home | Finished download of boinc_job_script.iSxo8L
2/18/2015 12:19:08 PM | ATLAS@home | Finished download of 45vLDmaFKilnDDn7oo6G73TpABFKDmABFKDm9UNKDmABFKDmBCqGon_EVNT.01469885._000562.pool.root.1
2/18/2015 12:20:12 PM | ATLAS@home | Starting task 45vLDmaFKilnDDn7oo6G73TpABFKDmABFKDm9UNKDmABFKDmBCqGon_0
2/18/2015 12:20:17 PM | ATLAS@home | task postponed 86400.000000 sec: Please upgrade BOINC to the latest version.
2/18/2015 12:21:29 PM | ATLAS@home | task postponed 86400.000000 sec: Please upgrade BOINC to the latest version.

Perhaps your should check the project forums. Specificly this thread
Please upgrade message