I've got a brand new DELL OptiPlex 980, Windows 7 64-bit, that keeps freezing. This is a point of sale computer with several peripherals attached (bar code scanner, receipt printer, signature capture pad, keyboard, mouse). The computer freezes two to three times per day at seemingly random times. Sometimes the user hasn't used the computer for say 20 minutes, they come back and it's frozen. Other times, the computer just freezes while the user is in the middle of using it. By freezing I mean, the user can see everything on the screen, but is unable to move the mouse, use the keyboard, etc. A restart fixed this problem.
I have looked in the Event Viewer and didn't see anything unusual. Just flags associated with the computer not restarting properly. Believing there might be a problem with the computer, I swapped it out for an identical brand new OptiPlex 980. The second computer had the same problem and the original computer is now working with with no peripherals attached other than the keyboard mouse.
I installed several of these point of sale systems at the same time, all with the same hardware, drivers, etc. This the only one having problems.
Any help on where to go from here would be appreciated. Thanks.