|That's bogus - almost always the case when something reports so many viruses (it always says 38).|
Download, install, update and run MalwareBytes freebie. It is good at getting rid of those things.
If "that thing" won't let you run MalwareBytes then change its exe file to bat (that applies to either the download or MalwareBytes program). Other ways are to download it on another computer, using a flash drive, or try running it in Safe Mode.
After that, my own view is to uninstall McAfee and install one of these freebies:
Microsoft Security Essentials.
If you see one of those bogus things again sometime, don't touch the Window even to cancel it. Turn the computer off and reboot.
We all live on the same ball.