I have recently had xp reinstalled on my computer. I am randomly having the following problem. Sometime I will boot up and it won't recognize my mouse (the mouse won't move) and if I hit Ctl-Alt-Del several times, the task manager will finally appear, but it won't allow me to use it. I can't click on it, I can't hit "E" to end task. Basically, it seems it won't recognize my keyboard or the mouse. Everything is just locked. So, then, I manually turn the computer off, which I have been told repeatedly is very bad for the hard drive and which I have had to do dozens and dozens of times with this computer. When I turn the computer bafck on, everything works. Then it might work fine thru several restarts, then it won't work again. My mouse is a plug-and-play, very old (and very good) Logitech TrackMan Vista. BTW--computer is HP Pavilion a1540n running windows media center edition but without all the unneeded HP junk on it. I don't know if this is significant--probably not since this problem was happening before this new thing appeared--but in the lst several days, I will go to a website in Internet Explorer, and I will get this error message of "stack overflow at line: ___." I click OK, and then it lets me go to the site. Prior to this, it would also not save my refresh rate (defaulting to 60 Hz), but I have fixed that via the registry. Finally, I have checked the "notify me of replies" box for the discussion forums, but I never get notified. Thanks for any help you can provide.