When you try uninstalling/reinstalling you should always use the normal method of uninstalling via Control Panel first. Then if necessary to make sure it's a clean uninstallation run the MCPR cleanup tool, see Useful Links at the top of this page. Reboot and try the installation/activation.
Regardless of your choice of default browser McAfee relies on an up-to-date and fully functioning Internet Explorer, so try the following - you don't have to set IE as the default if you don't want to but it might help for this exercise:
Open Internet Explorer and go to Tools/Internet Options/Advanced and click Reset, Apply and OK. (If system is 64-but use the 32-bit version of IE - both versions are shown in Start > All Programs)
Close and reopen I.E. and go to Tools/Manage Add-ons and re-enable any add-ons you need.
Try to activate again.
Kindly let us know the below details ;
What is the operating system of the PC?
Did you run the McAfee removal tool prior to the reinstall ?
Were the programs installed from a CD or from the web ?
Hello Dinesh, well sadly I wans't aware a removal tool existed, I guess because I've never had to uninstall the programs before. The program was reinstalled from the web, but orignally from a CD when I did a factory reinstall. The OS is XP Pro.