OK. I found these files in C:\ProgramData\BOINC. The stderrdae.txt file is the only one that has data and there are no time stamps for the messages and there are no error messages. There is only the following messages

Another instance of BOINC is running.
GLE: Another instance of BOINC is running.
GLE: Another instanc

This hang has not happened in a week or so and may not happen again for several more weeks. The only way I can recover from the hang is to power down my desktop computer (Windows 7, 64-bit, running on a dual-core Dell) and power back up. When I go through this process will any data recorded in the log files be preserved or will it be lost since this is a hard failure?

When I go through this process will any data recorded in the log files be preserved or will it be lost since this is a hard failure?

It won't be recorded. Only if a definite crash happens, which closes the program and frees you to the desktop, will information be written. When your complete computer hangs, the write process hangs as well.

BUT: I think your past experience was because your system ran with 2GB of RAM.
Why not test with the full 4GB first, and see if you can reproduce the problem? We're not going anywhere, you can always pick up this thread or start a new one when you experience it again.

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Let's close this thread out. I'll create a new one when the problem occurs again.