There was a BASIC interpreter we used for "Into to Computers" I slept through in college. It ran on XP, which is sort of new enough I suspect you could get it rolling on a 64 bit OS, and with Windows 7's Ability to run crap from years ago, it would probably work.

I can't remember exactly what it was, but it was either QBASIC, or based ON that one. If you check Wikipedia for BASIC I'm pretty sure they had something on ways to use it today, which would link you to whatever still works.

Wikipedia needs at least SOME use.