Windows host process(rundII32)has stopped working.

Question

Every time I start my computer or if I try and access certain areas such as the security centre,change screen resolution or even change desktop icons the above message is displayed.A message appears saying windows is looking for a solution but it never appears! It does not appear to affect the general running of the computer,but I am a bit concerned I might have a serious gremlin in the system.I have tried a system restore and have done several full system scans with Norton and System Mechanic and they both report the system is working properly!Have you any ideas because I"m stumped!