[Snuffy]

OK, several programs have been noted to delete the restore points...
easy way to assist is DL and install FREE Belarc.. run program save the log as txt file... open and remove all KEYS..(stop the pirates from stealing your KEYS), then either attach the log or link to where we can DL and view...
instead of asking bout all the possible this will make things faster..

Are you dual booting?
Are you using Kaspersky AV?
Are you using CC?
Are you using Nortons?
Are you using Shreeder?
Are you using Eraser.com?
This list is SUPER LONG, SO please post the Belard file... for a faster assist.

Where is this setting at?
increase the amount of space System Restore is allowed to use (My Computer/ Properties/ System Restore and slide the slider to the right).

Snuffy