Can someone please help me in finding out why my system runs slow?  I have a Dell XPS T600 Dimension.  It will run great when I first start it up and if its not being used for a little amount of time (under 1 hour) it starts losing time on my clock and it takes a very long time to do anything...internet, worperfect, quicken, etc.  I have left it on all night and the next morning, my time was 2 hours or more less than the actual time.  My mouse barely moves around and it is impossible to get it to go where needed.  I have tried running Scandisk and defragmenter.  If I start typing and get the least bit ahead of the computer, it starts beeping.  Thanks for any help that can be offered.  :-)