Right-click and double-click, both don't work?
It may be corrupted somehow.
Try the Virtual Technician although it sometimes doesn't work with software provided by 3rd party suppliers such as BT.
If that fails then go to Control Panel > Programs and uninstall McAfee.
Then run the MCPR cleanup tool listed under Useful Links at the top of this page and then reboot.
Re-download and install your software.
Just in case you are using Registry Cleaners, this is the sort of thing they cause so be careful using them.
Marking as 'Assumed Answered' as post is over 5 years old. Locking thread.