I have to do a system restore to an earlier date on my computer....if i do this i will lose fish tycoon...is there a way to save fish tycoon to a cd then reinstall it where i left off?

The best thing to do is to copy your Fish Tycoon installation file (the one you downloaded from the site where you made the purchase) and the savegame file(s) to a CD or other removable storage medium. There can be up to 5 of them (FishSaveGame1.pts through FishSaveGame5.pts) and they are located in the directory that you installed Fish Tycoon to. Once you've done the system restore, you should reinstall the game and then copy the savegame file(s) back to the folder. It's a good idea to pause all of the games before you do this, just in case it's very long before you get back to the games.