need help!! T_T my laptop got slower recently so i did what i could (defragment, deleted unnecessary stuff n programs, has nearly no startup program). it seemed like everything got better. however, today i had about 4-5 windows up (just internet n windowlivemessenger) and message came up saying that (i dont exactly remember) virtually memory is full so windows will start to resize it or something like that. so i waited for about 20min (at this point it was so slow that i couldnt do anything) and then i couldnt help waiting so i just pushed on power button. the real problem began here. it just doesnt boot up!! what happens is, the window sign comes up and it seems to be doing fine, and then screen blacks out (i can see my mouse though. strange) and it doesnt continue on to account windows signin page. i tried diagnostic, safemode and other options but the same result comes up. everything is well until it stops right before the signinpage. please... someone help me~

Hitting the power button wasn't a good idea. You probably have disk corruption. Boot up using your XP install CD using the instructions here and type CHKDSK /F and hit Enter. The disk checker may well take a long time, so DON'T be tempted to power off or hit reset. It may be your only option short of a format & reinstall of XP. If it completes successfully, reboot, and hopefully all will be well. I've had to do this on several occasions for both friends and clients. You may get a problem with a program or two and have to reinstall them, or find that a file is corrupted. It's also possible you'll have to do a repair install of XP, but one step at a time is a good idea. Any problems post back. Success - post back also, nice to know if it works OK.