hi, I bought a Windows 7 key for about $30 about a year ago and I didn't think about this until now but is my key authentic? I bought the key on a website I can't remember through PayPal and it still works to this day but should I be worried if it gets deactivated? How can I be sure it wasn't used before? also if it does get deactivated, will I lose all my files or will I just need a new key?
I should also add that so far my windows key is working perfectly. I got the updates and even got the windows 10 update (even though I didn't update to windows 10). When I check under my computer, it says windows is activated also. If I do decide if I should get a new genuine key from Microsoft themselves, will I have to reinstall windows and lose all my files? Or do I just need to make sure it's wondows 7 pro (because I have pro)?