Go to your programs list and uninstall any version of Java except the last one.
Go to Internet Explorer (because McAfee interfaces are in fact web pages, sort of, and rely on IE) and do the following:
If you are running IE8 (any version) uninstall it.
If you are running Internet Explorer 7 go to Tools/Internet Options/Advanced and click the Reset button. OK and exit, close and reopen IE7.
You will have to-enable all the browser add-ons.
If Internet Explorer 6 - go to Tools/Internet Options..
General tab: clear cookies, history and temporary files
Security tab: set all zones to default
Content tab:
disable Content Advisor
Advanced tab: set to default. OK and exit.
..and for good measure...
Scan you machine for malware using the free version of this tool:
http://www.superantispyware.com/supe...freevspro.html