Folks this is getting really confusing as everyone is jumping in with a "me too" response.
The real Technical Support is via the link at top left of this page - online Chat.
Basically a few things to try would be to ensure that Java is totally up to date and uninstall any old versions.
Make sure Windows is totally up to date with all updates both critical and non-critical.
Regardless of default browser ensure that IE is set to its default values under Tools/Internet Options/Security (all zones) and Advanced. Also ensure that Content Advisor is off under the Content tab.
Ensure that your system clocks are accurate.
Try the following:
1. Uninstall all McAfee programs through "Add or Remove Programs" in Windows "Control Panel".
2. Use the MCPR tool, see this article: How to remove supported McAfee consumer products using the McAfee Consumer Products Removal tool (MC...
This will remove all McAfee remnants from your computer. (you must have Windows Vista, XP or 2000 SP4 to use this tool)
3. Launch Windows Explorer and delete all McAfee files in "Program Files" but especially in "C:\Document and Settings\<user>\Application Data" and "C:\Document and Settings\All Users\Application Data". You have to set Windows Explorer to show all hidden files and folders (Tools > Folder Options > View tab). Just delete the McAfee folders even if they are empty in all the "Application Data" folders. Can be more than one!
In Vista: C:\Program Files, C:\ProgramData and C:\Users\yourname\AppData\Roaming
If you can't find these files don't worry. It just means that MCPR has done its job.
4. Reboot and redownload/reinstall your McAfee products directly from your account at the McAfee web site.
If all the above doesn't help then use Technical Support Chat as they have the power toi escalate the issue to a higher level.
Lonely Tripper is doing his best but with everyone and their uncle jumping into the thread it is now very confusing.
These apply only to the home products. If any of you are using Enterprise products then this is the wrong section.