The best thing I can tell you would be to return the processor and get another from your supplier. Or can you find a friend's machine that could support the CPU and test to see if yours in her machine will cause similar problems? (Be sure to back up your friend's data before trying this.)
My home system is similar to what you have (same processor and OS), and I've had no problems with it so far. It still has the original OS installation, so I couldn't say if that might not cause the problems you are seeing. If you get the same problems with and without HT, I don't think that is the direct cause.