Then you have to get rid of McAffe
Download the latest copy of Avast.
Save the download file.
Back up your files.
Reformat your hard drive.
Do a clean install of the O/S.
Install all your applications from the original disks.
Load the saved Avast download file.
Install Avast.
Reload your files, letting Avast check them out as you do so.
Set up your firewall. (You DO have a firewall, right?)
Now you're dancing.