My old man and mother-in-law each have a near new Acer aspire with Vista home premium as OEM. Both laptops are only used for minimal internet/email, neither has anything significant added to the OEM install. One runs Kaspersky, the other has Systemsuite - neither with any previous problems. Both PCs are well maintained in terms of de-fragging disk & registry, etc. The boot-up time of both PCs has progressively deteriorated from c. 30 secs down to about 7-10 minutes, including long periods with the "vista black screen". Looking around the web, this is obviously a very common problem. I've tried most of the solutions that have worked for some people, but to no avail. - disk defragmented (minimal frag) - registry de-frag & fix - start menu clean-up (using Startup Commander) - delete contents of pre-fetch folder - check that AV is not scanning at boot-up (no previous problem here) I was wondering if anyone has come across either a very good fix-it utility, or a comprehensive work-through that will eliminate the problem?