we have use windwos server 2003 sp 2 for antivirus server .now few days some error when i click in administrative tool -service it get error c:/windows\system32\services.msc access is denied error now what we do

Try start, run, msconfig and click on the services tab.

Does this error happen only on services.msc or on all msc files?

I ran into the same issue and fixed the problem by re-associating .msc files with the Microsoft Management Console (mmc.exe). Navigate to the C:\Windows\System32 folder and right-click the eventvwr.msc file (or any .msc file). Choose 'Open With'. If you see the Microsoft Management Console listed at the top of the next window, click on it to highlight. If you do not see the Microsoft Management Console, click Browse, navigate to C:\Windows\System32, and double-click the mmc.exe file. With the Microsoft Management Console or mmc highlighted in the Open With box, check the box for 'Always use the selected program to open this kind of file'. Click OK and see if the issue is resolved. bono.