I have exactly the same problem with my laptop, I use to log in our job network where I log in as user and password, now it takes like 2 minutes to start up.
But when working at home I log on as administrator and then it load up as nothing, way fast as new.
Any help will work I guess for many users since I have seen lots of posts like this one.
Starting about two Sundays ago (1/15), I've noticed that my laptop is painfully slow to start up (whereas it had not been before). I hadn't installed anything new (but I have installed things since). Everything goes fine, Windows starts, I get the welcome screen, that dissapears and my desktop show up but it takes at least 3 to 4 minutes before my icons and start bar show up. I just restarted now to test and it took 6 minutes. I ran Ad-Aware and scanned for virus' last Wednesday. Still crawling, but otherwise, once it starts, performance has not declined. Any thoughts as to what could've happened?