Best one is the best filemanager on earth, namely Total Commander- you just have to click enter on the .sfv file, and it verifies- that simple.
Total Commander isn't freeware, but shareware- but it's not time limited or crippled in any other way: it's only limitation when unregistered is a nagger when fired up. If it bothers you, then buy it- 28 euros ain't a high price for the best windows program, ever.