I've had the free version of Avast
for well over 3 years now and just love it. The new features in Avast 8, which include a browser cleanup and software updater, are ingenious in my opinion.
You'll want to use the AVG Removal Tool
to rid your system of all the residual files that might be left behind when uninstalling AVG. For future reference, there is an appropriate way to uninstall the old AV and install the new AV of choice:
1st:) Download the Removal Tool for the AV that you plan on uninstalling to the desktop. < DO NOT run just yet!
2nd:) Download the AV of choice to the desktop. < DO NOT install just yet!
1st:) Close ALL programs and disconnect from the internet.
2nd:) Uninstall former AV from the Add/Remove programs (in XP) or from Programs and Features (in Vista and above).
3rd:) Run the removal tool for the AV that you are removing.
4th:) Install the AV of choice, register if needed, then update and run a scan.