I did a search, turned up these.
I'm not sure you can post links so I'll give you names to google.
"Corman Common Lisp" - 2.51, says its ANSI compatible and comes with a compiler. Free for win32.
"CLISP" - Common Lisp interpreter + compiler, compatible with win32. Free.
"DotLisp" - Appears to be a .NET implementation of Lisp. Don't know if there is a compiler. Free.