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Take a look in the event viewer to see what is listed there at the times that this is occurring.
Start> Control panel> Administrative Tools> Event Viewer
When the event viewer opens make sure that you are looking at the system log, across the top you will see titles above the different columns, find the one titled Event, if you right click on an item in this column and then choose properties a box will open with a description of what has occurred. See what you have listed there and let up know.
It sounds like you have a problem with your PSU.
Family and loved ones will always be a priority in my daily life. You never know when one will leave you.