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3 Computers keep restarting twice a day

I'm hoping some one might be able to help.

I am helping out a friend who runs a small retail business. He is running three computers all Dell Optiplex 330 w/Windows XP Pro SP3. The problem is that all three computers shut down and restart between 6 and 7pm everyday. They also restart some time during the night but we are not sure what time. They shut down at different times each day and never all at the same time. I checked Scheduled Tasks but there is nothing there. The store is in an outlet mall and no one else seems to have the same problem so I don't think it?s a loss of power problem. Does anyone have any ideas where to go from here?

Thanks for any help anyone might be able to provide.

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For the test did you?

In reply to: 3 Computers keep restarting twice a day

Install an UPS on one of them?

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Whats an UPS?

In reply to: For the test did you?

Whats an UPS?

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Links about UPS

In reply to: Whats an UPS?

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