The most likely cause is a corrupted restore point which will prevent other points from working. System Restore points are incremental, i.e. one point relies on earlier points and if one of those is corrupt the system cannot be restored.
Your only solution may be to turn off System Restore, reboot and turn on System Restore. All existing restore points will be cleared - they are of no use anyway in the scenario you describe.
Hi russgam. In addition to what Pete said, if for some reason you still can't get system restore to restore your computer to an earlier date after following Pete's advice then you can try Reinstalling System Restore.
I called my son-in-law and he connected up to my computer remotely. He is the help I got. He works on computer systems. Not sure what he did, but I sat back and watched.
Not only was my restore problem solved, but the svchost.exe application error also fixed.
My computer (HP 4100y) is running like it did when I bought it in 2006.