Windows did not pass genuine validation

Your copy of microsoft windows must be validated as genuine

Can you please elaborate more on this issue?

When did you receive that error? Where do you see that? Is your Windows legit? (Or pirated?)

If you bought just a key or bought your copy of W7 off eBay then it may well have been a pirated copy. If the same key is used by numerous machines then Microsoft can invalidate it; sometimes it can read valid for months and then bam; often after it is too late to file an eBay claim.

It is also possible you received a false positive.