You need to get yourself an Undelete program, (or a disk editor). Norton Undelete from Norton Utilities or EasyRecovery from Fix-It Utilities. These programs will search the drive for deleted files and help you to restore them.
PS. I wouldn't do too much activity on the computer until you get the undelete programs, and these should be ran from the CD for the first time until you have recoverd the files that are deleted. What happens to a deleted file is this: The OS replaces the first letter of the file name with a question mark. This identifies a deleted file, and these files are basically ignored by the OS in the future. The file's data is not just removed from the drive as you may think. Having been marked as deleted, the OS will use this space, or part of the space, on the drive in the future for other files. Therefore, if you copy, install, etc. files/programs, the OS may just decide to use the space on the drive that this deleted file occupies, which means a recovery would be impossible. Therefore, get an Undelete program as soon as possible and start it from the CD or floppy disk - the files installed onto your hard drive by the Undelete's installation program may just copy over those files that you want to recover!
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About recycle bin
How could I recover my personal files if I had emptied them in the recycle bin?