I have a fujitsu laptop with windows xp sp3. it had mcafee and other junk software installed, which i removed. I also went into msconfig and services.msc to disable some unnecessary services. at some point the laptop started taking a long time to boot up 2-3 minutes.
I can see the splash screen (windows xp), gets to the "welcome" blue screen and then to a plain blue window where it sits for about 2-3 minutes - minimal activity on the HD. Then the HD starts spinning (can actually hear it) and processing startup programs and it eventually loads to the desktop and everything functions normally then.
I've uninstalled the new antivirus, reset all services and msconfig back to it's original config and nothing seems to fix the problem.