UPDATE
The PC World Tech Guy ran through a few things with me over the phone , altered a few settings , disc clean up , virus / spyware check, defrag hard drive etc
It's still very sluggish and random freezing on WHITE screens NOW !!
Probably have to take it back into them and have a fresh start !
We only bought it on 23/7/10 and it went back in for a complete re-install in Sept after 5 weeks !! Now it's beggered again ,
Do I have any right to DEMAND a NEW PC ???