Hi Rajesh,
I have eventually been able to delete the temp and prefetch files, the laptop kept freezing?? To be honest there wasn't a lot of stuff to delete.
So far I have seen no difference since those files have been cleared, infact it could quite possibly be the worst I've seen it?
I have windows firewall and avast antivirus/spyware installed and they are both running and up to date.
Regards Nick...