I managed to crash my Windows 8 x64 machine while creating the system repair disc -- now it crashes on boot. Anyone know where/if I can get a system repair disk ISO I can burn with another computer? I recently upgraded, and went with the no-media "download and install" option. Whoops!
There was a project for Repair disks for Vista. Sadly this appears to have been discontinued now due to legal reasons. You could redownload your Windows OS disk from Microsoft or use the disk that came with your computer. It will work in the same way.