This computer boots up to the login screen in a normal amount of time. However, once I log in, I find that the computer runs very sluggishly with apparently very heavy disk access. This lasts upward to one minute.
I put Sysinternals' file access monitor in the startup folder and it showed that explorer.exe was accessing tons of files during this sluggish period. I can't really determine if it's hitting every file on the HD, but it's a whole heck of a lot of them rather than a small subset over and over.
Once the computer gets past this initial condition, it operates normally in all regards never having another one of these "fits."
I've run Virus utilities and it always comes up clean. I've also defragged the drive on more than one occassion with no notable improvement.
Thanks for your assistance.