Cygwin would work good for that if you can figure out how to get it running. As far as a Linux emulator in Winblows, that's about as good as it gets. Like the guys said up above, you could always get a copy of a Linux distro that you can boot off of a CD. SuSE does this fairly well, and I find that SuSE is a good transition Linux distro if you are very well versed in Winblows.
The best thing you could probably do is install a dual boot setup. I'm a fan of SuSE of course, being that's what I'm in right now. SuSE installs very nicely right next to Winblows, and allows for some decent functionality. That's what I've done and it works pretty well.
Cheers
John Herreshoff