system shut down

[D]

My system will not shut when I got to shut down. The file
advapi.exe keeps running. I have to ctrl/alt/delete,
manually shut down the file; advapi.exe, then go back to
the shut down. How can I correct this?
thanks
d

[Dale]

You've been infected.

http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=BKDR_NETDEVIL.12