Thansk for your continude support fellas, much appreciated. As for my PSU I recon I need approx 416W (including the additional 30%), however my PSU was based more on price and advertised wattage rather and little else. I shall look to replace it so I can rule it out in future.

Not great news that my troubles are far from over, I was thinking about upgrading mt graphics card so I shall probably do that too, hopefully eliminating that as a possible cause, the CPU however is a little too expensive at the moment to replace 'in case' it is at fault.
Is it safe to say my HDs are OK?
Cheers.