Another unhappy AVG customer

Well I had NIS to begin with and my subscription ran out.  I ddin't have the money to upgrade, so i downloaded the free AVG 2012 trial.  That's when my computer world came crashing down because i didn't know i was supposed to unistall NIS first.  Well, when the avg expired I installed NIS-paid download.  I uninstalled NIS 2012 from the control panel -->remove program, etc...  Apparently, I still have remains of both programs.

 

I have been trying to figure this out for a week now.  I downloaded the avg remover tool, but i get an error message; it doesn't do anything.

 

Beyond Frustrated! please help me.  I need to be safe online for college classes.

 

Below is a screenshot of one of the error messages.