Along with my McAffee virus protection, I also use a free
software program called 'MalwareBytes'.. It finds stuff
that the antivirus doesn't..

When I download an .exe file, I check it with MalwareBytes
before I run it.

It is also FREE. Tho the free version does not run all the time.

You have to run it once in a while manually.. but it does work..!