Hello, I have problem with my computer (i7 920, 2PCB Asus GTX 295). I've installed Boinc 6.10.18 and latest Nvidia drivers (196,21) on my win7 64b, but Boinc cannot found any GPU's - "No Usable GPUs Found."
I've even tried to install some drivers from http://developer.nvidia.com/object/cuda_2_3_downloads.html, and then again Nv 196,21 driver, but it doesn't work.

17.2.2010 23:55:48		Starting BOINC client version 6.10.18 for windows_x86_64
17.2.2010 23:55:48		log flags: file_xfer, sched_ops, task
17.2.2010 23:55:48		Libraries: libcurl/7.19.4 OpenSSL/0.9.8l zlib/1.2.3
17.2.2010 23:55:48		Running as a daemon
17.2.2010 23:55:48		Data directory: C:\ProgramData\BOINC
17.2.2010 23:55:48		Running under account boinc_master
17.2.2010 23:55:49		Processor: 8 GenuineIntel Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz [Intel64 Family 6 Model 26 Stepping 4]
17.2.2010 23:55:49		Processor: 256.00 KB cache
17.2.2010 23:55:49		Processor features: fpu tsc pae nx sse sse2 pni mmx
17.2.2010 23:55:49		OS: Microsoft Windows 7: Ultimate x64 Edition, (06.01.7600.00)
17.2.2010 23:55:49		Memory: 5.99 GB physical, 11.98 GB virtual
17.2.2010 23:55:49		Disk: 465.76 GB total, 415.83 GB free
17.2.2010 23:55:49		Local time is UTC +1 hours
17.2.2010 23:55:50		No usable GPUs found
17.2.2010 23:55:50		Not using a proxy

Could somebody help me please? Thanks for responses.
KenR

You need to restart the system once or twice.

Well, I tried three times, but it does not work. Boinc still writes "No Usable GPUs Found"

You can not run BOINC as a service while GPU crunching.
Re-Install, go to Advanced and make sure it is not set to insatll as a "Protected Service"

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Thanks - Steve

Thanks. It's working and now I'm already downloading some tasks.
Thanks

Glad to hear you are up and working. Looks like you have quite a nice machine, it should produce some impressive numbers for you and your team!

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Thanks - Steve

Tasks are being crunched for science and for all humanity through it.

I have the same problem, but under openSUSE 11.2 x64. Any ideas how to win this bug?

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From Siberia with love!

i have this same problem running it through bionic manager advanced mode it gives this error, installed cuda, installed newest WHQL nvidia drivers I dunt get it?? win7 ultimate X64 P55 i7 setup nvidia geforce GTX260.

Use Windows XP for crunching (performs much better than Vista or Win7, and no problem running boinc in protected mode). If you insist to use Win7 for crunching, do not run boinc in protected mode (do not run boinc as a system service) because Win7 prevents system services accessing the graphic card.