Blue blank screen once I logged in windows server 2003

Hi

I have two operating system in my laptop Window 7 and windows server 2003 standard edition SP1. Both operating system working very good till friday. Windows 7 is working good today also but in windows server 2003 once I logged in , a blue blank screen is appearing, mouse is not working,task manager form is not open once I press ALT+CLTRL+DEL,no start icon or any thing apperaring except the blue blank screen.

Please help me.
Thanks in Advance....

The system freezed on the logon screen. The blue blank screen consist of login box. If it is not appearing boot in safe mode by pressing F8 on restart. If you are enable to login then check for hardware/software conflict. You can run system restore to fix back the old settings. It can also be related to problem of active directory.