I would like to know if my computer has been compromised

today I wanted to change my root password I went to the control center and then I pulled up the edit user menu. I saw two users one was mine

the other user that was listed was AVG

both had the same password. Does AVG mean administrator? am I suppossed to have 2 users even though I am the only user of the computer.

well in any case can any one tell me now to change my root password on SUSE 9.1?

not a suse person, but I'd do it at the command line. Open a terminal window, type "su -" to switch to root, then type "passwd" it will prompt you for a new password, and confirm it etc... What Desktop Manager are you running, that would help me help you do it through the GUI.

I ran suse for a while and I don't remember seeing any AVG user. But check your /etc/passwd and /etc/shadow to see if it is a real user or not.

I think that I have been hacked because when I started my computer today I saw a login for the AVG user. When I saw this I went to the control center and erased it. Is this enough to kick him/her off my computer?

Erasing an account will make it impossible for someone to gain access through that 'hole', but not impossible if other holes exists.
Besides, by erasing the account you'll disown processes and files which ain't good.

If you mean AVG as in "Anti-Virus Software by Grisoft", did you install their software? If not please:
- reset the shell to /bin/false, /sbin/nologin or whatever inert dummy shell you have
and check your:
- processes for processes owned by that user,
- filesystem for files owned by that user,
- login records (last, lastb, faillog) and system, application and firewall logs for any unusual activity.