What is it you're trying to say?
That BOINC Manager is just listening, not having established a connection with BOINC? But that's what it says when it complains that it cannot connect to a client.

What is PID 1516? Boincmgr.exe or boinc.exe?

Only when both BOINC Manager and the BOINC client are communicating with each other, will they be listed as Established. For instance, for me, it says:

        Local Address          Foreign Address
 TCP    127.0.0.1:31416        127.0.0.1:60777        ESTABLISHED     4336
 TCP    127.0.0.1:60777        127.0.0.1:31416        ESTABLISHED     4712

PID 4336 = Boinc.exe
PID 4712 = Boincmgr.exe

So normal communications.

What kind of firewall do you have on the Windows XP machine?

last night i downloaded and installed a 64bit version on another machine (win7)/4gb ram, the installation sequence was different, at some point i was requested for a project and login/pass info, in this case seti@home,

That's normal. When you install BOINC clean on a machine that's never had BOINC before, or where the data directory was removed, it'll offer you to add (a) project(s) at the end of the installation. This also shows that both the client and the manager are running and that they can communicate with each other, something that they don't do on your XP machine.

So something on your XP machine refuses to allow BOINC its parts, the client (boinc.exe) and the user interface (boincmgr.exe), to communicate with each other. You'll have to figure out what that is. If you don't use the Windows firewall, but a third party firewall (Kapersky, Norton, ZoneAlarm, Comodo, Outpost, etc.) then you will have to instruct that firewall how BOINC should pass.

hi,

i uninstalled, installed new version, can´t conect to localhost,

this was the installation sequence: install->license->configuration->ready to install->installation-> launch boinc mngr,


last night i downloaded and installed a 64bit version on another machine (win7)/4gb ram, the installation sequence was different, at some point i was requested for a project and login/pass info, in this case seti@home,

thanks

Have you checked in Windows task manager that the client (boinc.exe) is actually running?
How did you install BOINC? Do you remember? As service, or as normal user?
Did you have a GPU at one point and did you remove it without uninstalling its drivers?
Could it be that something else on your system is using port 31416?
You aren't trying to start a second BOINC Manager, are you?

also i don´t see any active conection under tools->option->conections
though i have internet access

That's normal. This option is only used by dial-up and VPN connections, not by xDSL, Cable and LAN connections, as then the OS takes care of the connection.