How to stop infuriating windows system beeps?

from the command line, type:
net stop beep

and what if for some strange reason you actually want to turn them on again? You guessed it..
net start beep

Hiding a user name from the welcome screen in Vista and Windows Server 2008

I've been setting up a new database server with Windows Server 2008 DataCenter Edition and I have added users to run specific tasks with restricted permissions, such as filesharing or SQL Server users. I didn't want these accounts to appear on the initial Log-on screen when the system booted but there was no obvious way to hide specific users from this main screen in User Settings.

After trawling the net for a while I came across a great post from Brett Maytom detailing how to disable these users in Vista here. This works for me perfectly in Windows Server 2008.