Hi all, have now tried off line and in safe mode as you suggested but still get the message that Restore incomplete, cannot restore to earlier date. Apart from this one fault the PC appears to be working normally. I have run 5 different antispyware scans and AVG antivirus scan, all of which show no threats and pc working normally. Any further suggestions please.
Once you have checked the size, and increased it probably, re-start your computer and then set your own Restore Point (you have already said that everything else is running ok). Then in a few days time or maybe a bit longer, try System Restore again using the restore point you created yourself.