Please run AVGremover and install with full installation file:
If it still does not help, try to install in safe mode.
If issue persists, provide us with installation log file:
You can upload the file to some online storage service and provide us with link to it:
I have attempted twice to install AVG11. I got this message twice:
Service "AVGID Agent" could not be stopped. Verify that you have sufficient privileges to stop system services.
I'm running Windows XP Home on an HP pavillion a706n.