I would say just to first backup your project files and wave files asscoiated with those projects. Then the next step is to format the hard drive and install a fresh copy of the OS. Most of the time you'll need a bootdisk unless you have a bootable XP cd. If not you can use any windows bootdisk to get into dos. Once there format the drive. After you format you'll have to restart the machine. Once the machine restarts, go back into the bootdisk. When back in dos, access the CDROM and go to the I386 directory. Once in there you can use the WINNT command and it will load the files for setup.

That is just how I normally go about doing such. Hopefully it is of some help to you.