My problem is my computer is not getting start into safe command prompt. So, I put in the Windows XP CD and repaired the installation. After that it starts fine, comes up to the login screen and shows message Windows requires to activate in order to run. I click on yes. But nothing happens for long time. Then I understand there might have two problems. One the Windows XP disk I used was not actually for my computer and it was a Windows XP SP2 disk and my system is Windows SP3. So I downloaded Windows XP SP3 on another computer and installed it one more time. In that I able to get only a safe mode command prompt. Safe mode as well as safe mode with network and normal mode all ask for activation then nothing is worked. I am stuck over here if anyone having this solution for this then pleases reply.