If you have installed XP or Vista, but still have the Recovery Partition (a.k.a. It wasn't deleted), here's what you need to do to access the System Recovery and get back in business... This obviously assumes that you do have XP or Vista installed, and just can't access System Recovery. It may work for Windows 2000, but I don't want to go through this again to find out...
Step 1: Right-click "My Computer" and click "Manage"
Step 2: Go to "Disk Management"
Step 3: Right-click the "Drive D/Recovery Partition" and click "Mark Partition as Active"
Step 4: Reboot, and press F11 as it starts up