I've been having this problem for some time now and it's caused me to stop running Seti here on my work computers :(

I have two systems that are on 24/7. One I built just for Seti, my other is my workstation. Specs are outlined below for reference.

Both systems have fresh installations of Windows 7 Ultimate 64bit SP1 with all the updates and Microsoft Security Essentials antivirus. Everything is up to date and nothing is running in the background. Zero chance of infection.

Both systems have driver version 14.1 which is the newest from ATI/AMD's site.

The systems boot up normally and the client loads in the system tray with a red mark to show that it's still loading. Soon as the pause mark goes away the system starts lagging badly. Very soon after, the screen goes black and you're left with a frozen cursor. The CPU and GPU fans still ramp up and down and there seems to be hard disk activity every now and then, but as far as I can tell the system is hung. Nothing changes if you wait even for days.

One time I did see a popup from either Windows or AMD that said the display driver had stopped responding and was recovered.

I'd chalk this up to some incompatibility with the system or its drivers and the Boinc software but I have TWO that do the same thing!

Neither system is overheating either!

Are there logs I can check to possibly find the solution?

System specs:

System 1:
Asus P5Q-E
Intel Core2Quad Q9400 (stock clock, Zalman cooler, new paste)
8gb DDR2
Sandisk Ultra 120gb SSD
2x AMD Radeon HD 5770 1gb in Crossfire

System 2:
Foxconn A74ML-K
AMD Athlon 64 X2 5000+ (stock clock, stock cooler, new paste)
4gb DDR2
WD Velociraptor 80gb
AMD Radeon HD R5 230 2gb

It's most unlikely to be BOINC causing all that by itself, but it might be related to one or other of the SETI@Home applications.

Might be best to post at the SETI@Home forums (if you are a new member there too, you can still post in the 'questions and answers' area) - with access to your account data and computer records at the project, including what tasks have been allocated, other members will be better placed to help you.

Thanks, new to these forums. Posted over there!