Hi
That error message would suggest that one or more of the System Restore
files have become corrupt. You can try turning SR off/on, although you will
lose all existing checkpoints:
Right click on My Computer and select Properties>System Restore. Enable
'Turn off System Restore on all drives' - then reboot your PC. Go back into
SR and disable 'Turn off...' and then reboot again. After the second reboot
you should have one new checkpoint and SR should work properly after that.