hi everybody, i am using windows 2000 server,from few days i am facing following problem-1. its paste button is disable.2)browser is not behaving normally. but when I restart my server it works fine for some time,and again showing the same response,Is there is some virus problem,or some other problem,pls help me

It wold be possible that you server's problem are being related with viruses.

W32/Lovsan.worm.a sympthoms, as Network Associates says, are:

- Presence of unusual TFTP* files
- Presence of the file msblast.exe in the WINDOWS SYSTEM32 directory
- Error messages about the RPC service failing (causes system to reboot)
- The worm randomly opens 20 sequential TCP ports for listening. This is a constantly revolving range (ie. 2500-2520, 2501-2521, 2502-2522). The purpose of this action is unknown
- inability to cut/paste
- inability to move icons
- Add/Remove Programs list empty
- dll errors in most Microsoft Office programs
- generally slow, or unresponsive system performance

You can obtain more info at:

http://vil.nai.com/vil/content/v_100547.htm
http://www.microsoft.com/security/incident/blast.asp

Good Luck!
Cheers.