system disk reboot

i bought it in 2001, it was so full of stuff ran slow, seemed to work fine other than that. I was trying to get a few more miles out of it. Use it for research/school work mostly. i know it could use more memory, but it seemed to work fine before with the school work stuff, i cleaned it up in hopes i could just do some more of the same. there had been a lot of music files, and i wanted to clean up the registry.

I don't know how to do hardware updates.... (that is what to look for when searching) i think my new computer w/vista has a place to search for hardware updates. i don't know if this older unit has the same feature.