How to disable anti aliasing xp

Right click on your desktop:

Choose whatever control panel that's installed for your system (CCC, Nvidia).

Go to graphics properties and there should be an AA button there - if you disable it there it should disable it for all games.

Also it depends on the game - some games just don't allow you to change any graphics settings at all.

But if your in the game - usually if you go to Display settings/options it should give you a choice of AA quality settings.

If that doesn't help - list your complete system specifications. As well as the game your trying to change the AA in.