Can I use Webroot to uninstall Norton antivirus from a machine that wont let me uninstall it.

The computer I'm refering to was my older computer that still worked fine until my better half went somewhere she shouldn't have.  Whatever viruses she encounterd made a home on that computer.   I couldn't even get the anti virus program to complete a scan.  The computer I'm working on now is a gem and Webroot workswithout and trouble. 
 
I tried to install Webroot on the older crippled computer.  The firstproblem I ran into was the viruses in the computer had wiped out all information for connecting to the internet which was required to install Webroot from disc.  I was finally able to get that computer to recognize the internet and I was up and running getting Weboot to install.  I'm soory this is taking so long but the next paragraph hopefully will explain my problems on that computer.
 
Webroot found not one nor even two, bvut a whole colony of viruses that were reproducing and destroying the computer.  After Webroot finished cleaning the computer I tried to complete an easy program removal I thought.  The program I was trying to uninstall (Norton Antivirus), but it was full of hidden viruses that webroot cleaned out.
 
So now I have a clean machine, hopefully.  I wont run both computers at the same time untill the formerly crippled computer is safe.  The computer will not remove Norton through the app removal program.  Can I use Webroot itself to uninstall that program and how do I do that?
 
Thanks for all the help I get from the community.
 
Jeff S.(maggies friend)