I have ben having this problem for about a year now. It makes no difference what version of boinc or GPU drivers I use.

After a restart of windows Boinc reports a missing GPU. If I exit boinc and reinstall the drivers (for my AMD/ATI 6950 GPU) and then restart boinc It works fine until the next time windows restarts and then I have to reinstall the drivers again.

At least I can still run my projects but I'm getting frustrated with having to reinstall drivers every time I run an update that requires a restart of the computer.

Does anyone have any Ideas of how I can solve this issue? Maybe s setting in the registry or something.

I'm running Windows 7 Ultimate X64 on an ASUS Crosshair V Formula with an AMD 1100T processor, 16 GB Ram, and an ASUS EAH6950 DCII/2DI4S/2GD5 that has been flashed to a 6970.

Any advice would be greatly appreciated.

Cross posting about it on Einstein and Milkyway, will only yield the much of the same questions.

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OK. Even after uninstalling and then wiping with driver sweeper ther were still several files left behind and all of them were part of OpenCL.

http://devgurus.amd.com/thread/160303

The Catalyst installation doesn't over write a file if it already exists, if the version is the same. So if a file gets corrupted reinstalling drivers doesn't fix the corrupted file.

AMD knew this but did not fix their uninstaller to solve the issue. They did make a cleaning utility that will fix this. The only drawback is it also removes chipset, and other driverfiles for their motherbord hardware as well. So you will have to reinstall all AMD/ATI drivers thsat you have on your system.

The file is for Windows 7 ONLY!! There are reports of it messing up windows 8 to the point of having to reinstall windows.

http://sites.amd.com/us/game/downloads/Pages/catalyst-uninstall-utility.aspx

OpenCL is now working as it should again.