So for the past few months, around 2 or 3, when I turned on my computer a thing popped up saying "Windows not genuine." and it wouldn't bother me because it wasn't really doing anything to me at the moment but now its kinda ticking me off and I googled how to get rid of it and it said to download windows 7 loader, and I did and I did what I was told to and when I click install it says: "an error has been logged to the systems event log." and I don't know how to fix that either?

can someone please help me? :\