How do I get rid of the AVG anti-virus from my computer, the one that was free.  I want to uninstall it and it won't let me.  I want to put my new virus checker on and can't because of this blooming thing.

Have you gone down the Uninstall route via the control panel & install/remove ? This usally gets rid of unwanted program

Here is the best way to get rid of it (used in order to do a clean reinstall).

2, Using add/remove programs found in Start, Settings, Control Panel. Uninstall
AVGFREE7

3, Navigate to C:\Program Files\and highlight the folder named Grisoft and hit
the delete key.

4, Navigate to C:\Windows\All Users\Application Data and highlight the folder's
named Grisoft, AVG7 and hit the delete key you may find that there is only one
folder and not two. (WinME and WinXP)

5, Navigate to C:\Documents and Settings\ users login name\ApplicationData\AVG7
highlight the folder named AVG7 and hit the delete key (WinXP)

6, Reboot your computer. this is to update the registry in the computer

It won't let me delete it and I'm getting really annoyed now !!

Did you reboot the computer and go through all the steps?