I need help in resolving an issue with Windows Xp. The problem is that when I boot my computer I get the diagnostics screen where it asks you to go into safe mode or boot normally. After you select any of those options, the loggin process continues to go smoothley until it reaches the welcome screen where you can select the user. All I get is a black screen with my pointer. If I log into safe mode, I see the safe mode words on the four corners of the screen and I can move my pointer and everything but everything is black. I tried chaning the NTLDR file and NTDETECT.COM file but nothing happens. Can somebody help me?