Thanks for the help. The other thing that's happening at the moment is I'm getting Dr Watson Postmortem debugger error every time I load folders. Explorer (I think) then crashes and all my folder windows dissappear. Is there any way to fix this?
AVG hasn't detected any new viruses, neither did Trendsecure, which took an hr to complete. I'm now running Panda online scanner to be sure there are no residual viruses, like I said I did have one but AVG AV suposedly got rid of it.
Filemon was very useful in sorting this out, I think that I've now fixed the problem. I was looking through the entries and I kept seeing this c:\windows\system32\shell32.dll. There were a lot of shell32 files, although I suspect that these are simply to do with the windows kernel or something like that. Anyway, continuing down the fltered list I came across Diskeeper, ahhhhhh! how embarrasing. I hadn't set up Automatic degragmentation on my f: drive but as it turns out, Diskeeper has an option (enabled by default) which auto scans for new volumes and adds automatic degragmentation to them. So when I added my hard drive it must have gone, oooh there's a nice drive to defrag and then tried to degrag it in the background. It'd be nice if it could have told me about this.
Anyway, problem fixed, thanks for the help, I just need to fix that Dr Watson thing. I know there is a Dr Watson virus, but I think this is just the real one crashing for some reason.