I'm just new to this site but I was hoping that someone could possibly help me.

My computer which runs XP was working fine and I tried to change the ram in it but it didn't work so i just put the old ram back in and it started to work fine again but then the next day it kind of stoped working... When I start it up it starts good and has power supply but comes to this message

" We apoligize for the inconvenience, but Windows did not start syccessfully...." it goes one to give the options of starting in Safe mode , Safe mode with networking , safe mode with command prompt , Last known good configuration , or Start windows normally. but none of the work... it just brings me back to the same screen. What can I do??

chkdsk *: /r
(Note * denotes check all drives)

Use from Xp recovery console (by booting from your Xp CD