I'm running Windows 7 x64, yesterday using this build I had a BSOD relating to the file aswSP.sys (I think). I say I think, because I only had a quick time to look at the file name before the system automatically restarted. Of course, since the crash log was sent away to Microsoft and automatically deleted I can't check! This is the first every BSOD I have had since running Windows 7 (ever since it came out).
On a separate enquiry, I was wondering whether there is any use in Avast for the AVX instruction set on the new Intel Sandy Bridge CPU's and the upcoming AMD Bulldozer CPU's, and the FMA4, XOP, and CVT16 instructions sets which are also coming in with the AMD Bulldozer CPU's (Intel does not support FMA4, XOP, or CVT16).