I have just re-installed XP on my laptop as it became unbearably slow and sometimes would not boot. The problem came back and I can't pinpoint any particular software that coincided with it. When I turned off the Norton Internet Security start up programs in msconfig, it seemed to fix it. So I then uninstalled NIS but the problem is still there. Also I noticed when I defrag that the green "unmovable files" are in a different place now compared to when I brought it home from the shop. This must have happened during the re-install. I installed and ran Diskeeper and this shows my green system files kind of all over the place. Is this part of the problem? How can I fix it? My machine takes 10-15 min to boot sometimes. Help!