What programs are compatible with windows 7 to mount an .iso file?

I've been trying to figure out how to mount files, and I recently figured out that Daemon tools, alchohol, and many other programs I've found referenced on google have not helped me whatsoever. And the reason being, pretty much all programs you can download from the internet, or even disks are not compatible with windows 7. I've even ran them with windows xp format compatibility. SO I'm hoping someone on here knows of a prgram or some way to mount .iso files with windows 7, or some program that can be used to mount them, or some program with a 64 bit installer or something.

Thanks,

Tommy.