If you want to do this remotely, you can use PSExec, to execute the intellgent update install file.
PSTools (PSExec is in this zip):
http://technet.microsoft.com/en-us/sysinternals/bb896649.aspx
Create a batch file, and run the batch.
Something like this should do the trick:
REM ******* Updating <HOST> ********
copy 20100314-003-v5i32.exe \\<host>\C$\windows\temp
ECHO Updating <HOST> virus def files, Please wait...
c:\psexec \\<host> c:\windows\temp\20100314-003-v5i32.exe /q
del \\<host>\C$\windows\temp\20100314-003-v5i32.exe
Simple, but it may save you some time if you have a few computers to update.
Mike