Good morning XtrGamer and welcome back to CH
You can loose data if it is not backed up.
Good morning XtrGamer and welcome to CH
In short answer yes unless you save it / back it up before hand.
What OS are you going to be going from and too?
Mike
Are you buying a upgrade doing a fresh install what are you going to do
Please explain EXACTLY what it is you want / intend to do.
Please explain what you want or are going to attempt to do. The windows 7 that you want to move up to is a disk from OEM manufacture or are this going to be a upgrade and is it going to be the same version like you are going from windows home premium 7 32bit to windows7 64 bit home premium etc.
Please try to be as detailed as possible so you can help you, Mike