xp issues-

[Bert]

my pc freezes up on the screensaver, whereas, it takes
several attempts of trying to get the screensaver off to
use pc. Finally, after hitting ctrl-alt-del and then some,
it will be in a useable state. I also got this message
about windows recovering from a serious error message. my
pc also seems to run slower than normal. i have run
scandisk,checked for viruses, defragged, and the system
recovery will not let me recover either. I tried 5
different dates..help!