Recently I bought a new computer, Win 7 Pro, 64 bit system that many of my programs would not run on. One of these was Quick Books 2008 so installed QBs on my Vista laptop, downloaded the backup files I had on my external HD for QB to the laptop and managed to open my files. Great so far. A week later I had to make address changes to QBs, forgot that it was on the laptop and tried to bring up the files on the Win 7 Pro. There were QB files on the Win Pro machine because I had downloaded everything that was on the external HD to the new computer. Of course they weren't opening when I tried and I got a window that kept asking me what program I would like to use and I was looking through the list but couldn't find QB program (forgetting totally that it wasn't on that machine.) I stupidly tried to open them a couple of times and after the third time of closing that window...........all my QB files turned into .pdf files! I have no idea how it happened. Now I am afraid that if I do get an updated version of QB that will work on the Win 7 Pro computer, it will convert the QB files to .pdf. It changed all the QB files on my external HD to .pdf, too. Is there someway that I can reverse this disaster?