From something plugged into the USB to a failing HDD.
Try HDTUNE from http://www.hdtune.com/ and see if the transfer rate is low.
I recently did a refortmat of my computer because it was acting a bit sluggish. So right now the only thing on my computer is anti-virus software, steam with one video game installed and thats it. For some reason when I load up the computer, after I type in my password to logon, it takes 10-15 minutes to load up to the desktop of windows. Also, whenever I hit CTRL-ALT-DELETE the options appear right away for task manager and etc but when I hit task manager, log out, etc it takes another 10-15 minutes to load up. I know its not the one video game cause ive had it for years. WIndows vista does have service pack 2 installed.
My computer is a GT5453h
AMD athlon 64 x@ dual core processor 4200+ 2.20ghz
32 bit OS
I've never had this problem before. Any ideas as to how to fix it?