Not many clues here. The next time you use the CTL/ALT/DEL keys, wait it out to see if you get the blue screen with any error message. If so, post back with the exact message.
I have a HP Pavillion with WIN 98SE, 500Mhz, 64 MB SDRAM. I have been having trouble with my unit freezing up and not doing anything when I try to go online. I went to programs-accessories-system tools-system information, and it does nothing. I tried to right click and then click open, but still nothing happens. When it freezes up I hit control-alt-delete then click end and then click end task, but nothing happens either, so I end up having to shut down with the reset button. Any advice? Thanks for any help you can offer, Tom...

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic