In a 64-bit system you will find installation files mainly in Program Files but some will also go into Program Files (x86), so that's not ususual. (2 folders in each, McAfee and McAfee.com).
Don't try to alter the default installation direction, in fact I don't think you can anyway.
It's also not unusual for MVT not to find anything if you obtain McAfee from a 3rd party supplier who has tailored it to suit them, such as your ISP, or PC makers like Dell for instance.
Also in Windows 7 you shouldn't concern yourself with what Windows Security Center says about Firewall and Virus Protection as McAfee (& most other security software makers likewise if you were using them) now control that.
What isn't usual is that 'numerous restarts' which I hope were instigated by you and not the software.
It's possible that if you had previous versions installed that some corruption could have occurred in which case uninstall in the normal manner via
Control Panel > Programs > Uninstall a Program, reboot if asked to then run the MCPR Removal Tool,
downloadable through 'Useful Links' at the top of this page, reboot and reinstall from your online account page.
(Using that account rather than installation media always assures the latest version is installed).