The reason for this is when the screnn goes Blank, and by pushing CTRL+ALT+DEL u are exiting out of the Windows 2000 program code, and allows you to shut down individual programs there for Windows doesnt really run.
at times as well when u push ctrl+ALT+DEL you wont see nothing which is another prob, your system freezes. Dont worry about it and dont do it why push CTRL+ALT+DEL if your system freezes when the screen saver comes on chances are its the power Management
disable it in the Control pannel and Bios
Oaks@Swintex1.freeserve.co.uk