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I assume this is Windows 7 (With) Sp1 installed ? Please check your Windows Updates to assure that you are current, to include all Add-Ons and Internet Explorer. Even if you choose not to use it, McAfee and other programs do in order to function properly.
Should it indeed be the case that you do not have Sp1 installed, I would advise to Disable/Remove any existing Security software before attempting to install it.
You can find the instructions on how to Uninstall/Reinstall the Consumer Product here:
I would also make certain there is no Malware onboard. I suggest you Run the Latest McAfee Stinger (Read how to use)
and follow up with Malwarebytes (Free) for a second opinion. To keep it (Free) follow the instructions listed just before you
You can obtain these Superb Free Tools here :Anti-Spyware/Malware & Hijacker Tools
All the very best
McAfee Community Moderator