Hi,
The majority of the time this is caused by a corrupt restore point.
Turning System Restore off then on again will purges all existing
restore points, and creates one new one.
Try running System Restore from Safe Mode.
Restart your computer, and then press F8 during the initial startup to
start your computer in Safe Mode.
Log on to your computer with an administrator account or with an account
that has administrator credentials.
In Safe Mode type or paste the following command in the Start - Run box
then press Enter.
%systemroot%\system32\restore\rstrui.exe
There are also other possibilities that can cause this to happen. The
following pages have some troubleshooting steps to take.
Troubleshooting steps to take when System Restore fails to restore:
http://bertk.mvps.org/html/srfail.html
How to Disable and Enable System Restore
http://bertk.mvps.org/html/disablesr.html
Here are some tips on keeping System Restore Healthy and hopefully
keep the restore points from becoming corrupted in the future.
http://bertk.mvps.org/html/healthy.htm