Cheers matelot
I've reformatted the HDD and am in the process of reloading all my crap onto it. The Norton disk is sitting there while I decide what to do. Bought it in the US so returning is an option, although trickier than normal. Only paid $57 as opposed to £60!
Is it worth just using the anti-virus and leaving speed-disk well alone or should I send it back? Still have about 40 days of the 60 left.