I have Windows Vista Home Premium running on an HP Pavilion laptop computer.
I have noticed that my disk space usage doesn't add up, because my total
usage always exceeds what I can account for by 20-30GB, even after I have
included hidden/system files (or so I believe). However, I recently
installed SP2 for Windows Vista Home Premium, and noticed that somehow a
large amount of space (around 20GB) on my system disk had been recovered
during the installation. However, over the next few days this space
gradually disappeared again, seemingly without giving me anything in return.

Can anyone tell me what might be going on here? Better still, is there a way
to avoid this disk space usage problem altogether?

--
Stephen Luttrell
West Malvern, UK