Vista business on a Dell XPS. Yes, I've done a Google search, read the 100's of topics, and disabled the indexing and the websearch functions in "services". Also disabled automatic updates (although they seem able to switch themselves on again without my permission....). I've also eliminated or disabled just about every process in startup, and yet - every time I switch on, the PC hard disk starts hammering away - and continues on for at least four hours (timed it a few times). This is without me touching the PC or running anything. After four hours or so, the disk takes a break of about 15-30 seconds every ten minutes or so, but is otherwise continuously in action. I just don't get it: a well-used XP machine with a full disk and some fragmentation will still generally finish booting within a few minutes, and then sits quietly awaiting further instructions. A Vista machine seems to be working on a master plan to take over the world or something... Apart from the irritating noise and performance impact on programmes the user is trying to run, this activity can't bode well for the longevity of the HD - it'll be interesting to see whether there is a flood of user complaints in the years to come... What the heck is it doing? What else can I do to get blinking Vista to concentrate on my programmes, rather than its own agenda?!