If you have the original cd you don't need to worry about it, even if it doesn't work it shouldn't delete any of your stuff that you've created. Hell, I was so paranoid I copied my whole poser subdirectory to another drive....lol I think you will be fine though. It makes a backup of the old stuff. Make sure you still have any patches that you've already used handy, just in case you do re-install. Oh, and here's a tip, back up your registry first, name the backup Poser00. I would copy any original characters elsewhere though, just to be on the safe side. Also, if you can't find your serial number, (I put mine in the manual, learned that lesson the hard way!) Go to your Poser program and write your serial number down. I made a notebook with all my important numbers in it so I don't have to hunt them down anymore. Good luck, I think you'll be ok. Oh, don't write the serial number on the CD, someone did that with their hash CD and I guess it messed it up...he had to get another one from Hash. Marque