|If you just delete the programmes in the programme folder it will cause problems for the new owner as all the registry entries will still be there.|
The correct way to remove them is the Add/Remove in control panel. I would have thought that self explanatory.
When you have done, clear out the Recycle Bin so they cannot be recovered.
I cannot imagine whatever made you think that system restore would actually delete anything. For future reference, System restore doesn't do anything with user installed applications, neither delete nor restore. It only works on system files to get an unresponsive OS working ageing.