I, like Buttons, run my pooter nearly 24/7 and only reboot to do cleaning up like defrags and so on....I also firmly believe that the turning on and off does much more damage that constant running......If you find your PC's performance tails off then you should find some freeware programmes like FreeRam which flushes out your PC's memory and monitors pefromance.....You should also perhaps consider upgrading to XP which is a much more stable OS if you haven't already done so.