PC Freezes Up At Certain time of Day – NOT a Virus Scan

I have three computers in the office that around 2:00-2:30 PM every day they seem to have a huge spike in HDD activity as well as the PF shoots way up to about 1.3 gigs.

We’ve gone through making sure no SMS pushes were happening at that time, we’ve also verified its NOT a scheduled Virus scan.

Any suggestions or things to check?