Make System Restore Use Less Drive Space in Windows 7
http://www.howtogeek.com/howto/5482/make-system-restore-use-less-space-in-windows-7/
**Remove all but the last System Restore point.**Click 'Start' / All Programs /Accessories / System Tools / Disk Cleanup / Click the 'OK' button.
After cleanup finishes its calculations, down in the lower left click on 'Clean up system files' vand click 'OK'.
Now click on the 'More Options' tab and in the box named 'System Restore and Shadow Copies' click 'Clean Up'.
This will remove all but the last 'Restore Point'.
J W Stuart: http://www.pagestart.com