To uninstall Antivirus Software from Windows PC:
1. Click Start -> Control Panel -> Add or Remove programs (find your Antivirus Software) -> Remove
or
2. Start-> All Programs -> Your Antivirus Software -> Uninstall
Before you uninstall any anti-virus software, you should make sure you already have your new software, then disconnect from the internet and make the change. You do not want to have your computer connected to the internet without anti-virus software for even a few minutes!