I apologize for being so vague. I moved the folder containing all my bitcoin info to a flash drive and then rebooted my computer back to factory settings. I still have the original address in another place. And yes the wallet created a new address. Is there any way to add original address/move my bitcoins located at my old address to the new address. My OS is windows 7. My back up was supposed to be on that same flash drive, but I can't seem to locate it.

I had to reboot my computer and although I moved everything to a flash drive and backed it up when I moved it back to my computer the wallet had a new key. How can I put in the correct key? Currently it states I have no bitcoins.