If you got message ‘there are other antivirus programs installed’ after uninstalling the antivirus program and reinstalling a new one or automatic uninstallation through Add/Remove programs failed, follow below steps to solve the issue.
First of all uninstall the panda Internet Security 2010 through the Add/Remove Programs if not already done.
Now download the Uninstaller_10.exe (717 KB) file and run it. After finishing the process, restart your computer.
This solution is applicable to Windows 7, Vista and XP.
You may also like this comprehensive list of Antivirus Uninstallers.