Hard disk thrashing on Vista

I've been struggling recently with far too much hard disk thrashing.

So I searched around for help, and I've no idea if their advice helps yet, but this article seemed at least well written:

http://bucarotechelp.com/computers/windowsts/95021801.asp?x=62&y=6&page=1

Let's hope it helps - because recently the hard disk action has been way too slow!