I bought my windows 7 copy about 3 months ago, and it worked without a hiccup. Today, when I changed nothing, hardware, software, or otherwise, the only thing I did was play some games on steam and watch a few videos on youtube as well as some light web browsing here and there. Now, it's saying my windows 7 copy isn't legit, even though I put in my product key and everything. I don't want to go through the measures I saw online, disabling updates and deleting this folder or another. The reason for that is I don't want to go and mess within important folders and files. I have a copy of my windows OS and the product key with me, I don't want to lose my data too, is there any way I can solve this without a clean install or going through a couple hours worth on the already long line of Windows tech department?