Every now and then, especially on startup, my pc gets really slow. I check task manager and it says that there's 100% Disk usage. I have a 2TB hard drive with only 360 GB being used. After a couple of minutes of the slowness it goes away. Any ideas?
Is your anti-virus set to do a scan during start-up. Next time it happens, look at what processes are running and see if you can find out which one is doing it.