2 months back my Windows 7 Ultimate 64bit installation gave the "not genuine" error and the desktop went black. So I started bugging the person whom I'd bought it from. After 3 weeks of waiting for a response from his distributors, the error messages simply
stopped and I've seen no further errors since. I updated to SP1 and have not had any further problems.
Is it possible that a bug in the GWA program caused a false positive and was fixed since?