You need to turn off the power saver features. My Computer>Control Panel>System>Hardware>Device Manager>Universal Serial Bus Controllers> Double click each USB Root Hub>click Power Management>Un-check the box that says: Allow the computer to turn off this device to save power.
Now repeat that for all the USB root hubs listed. There are usually several. Then Restart the computer. The computer thinks it's saving power by turning off the USB mouse.
 

ruben0324

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May 9, 2010
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Could not find that info in My computer contrrol panel.
 
click my computer, on your desktop
click control panel, it's on the left hand side of my computer window
click the "system" icon, a window will open that says system properties
click the hardware tab
click the device manager bar
when the device manager window opens, scroll down, find universal serial bus controllers
double click universal serial bus controllers, it's on this list
now you will see a list, find USB root hub on the list
double click the first USB hub on the list
when the USB hub properties window opens, click the power management tab at the top of the window
now you will see a box that says: "allow computer to turn off this device to save power"
Un-check that box, click OK
Now double click the second USB hub on the USB Hub Properties list, click the power management tab, un-check the power saver box just as above and click OK
Now repeat that same procedure for all the other USB hubs on the list, un-check the power saver box in each USB hub, until you have done all the USB hubs on the list. There may be several, you must do each, one at a time.
Now close all your windows and restart the computer.
Now the mouse should stay on.
The computer was turning off the mouse to save power. It's a bug in XP.
 

ruben0324

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May 9, 2010
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Att: Soundguruman
Thank you for your help. You made me realize how little I know of my computer. The lesson was invaluable.
Thanks
Ruben