Next go to Start Menu >> Run, then type:
cleanmgr
click OK, when Disk Cleanup opens go to the 'More Options' tab and press 'Cleanup' on the system restore area which will remove all the restore points except the one we just created. To close Disk Cleanup and remove the Temporary Internet Files detected in the initial scan click OK then choose Yes on the confirmation window.
It doesn't freeze, but the process never completes. It just keeps checking. Should I just skip this? I should mention that prior to this System Restore, I had had it turned off, and had deleted all my previous restore points when I did so (about 2 months ago).