Originally Posted by CaptNKILL
You don't even have to do anything. Just move the steamapps folder out of the steam folder, but keep it on the same drive. It shouldn't even give you a file move\copy progress bar. Move it out. Reinstall. Move it back. It should take like 1 minute.
That's exactly what I did. 19Gb worth of data, less than 5 seconds of transfer time... total.