good Unix emulator for vista PC

Dear experts!

can you please advise if there are good solutions to emulate Unix on a vista PC? I'm on windows by default, as many on my crucial applications are exclusively win-based, so rebooting each time I need UNIX functionality in a double-boot configuration is not my case.. But I do like UNIX, it is very helpful, so I try to build up skills. The wanted emulator should provide for a (nearly?) full UNIX functionality, and, preferrably, be able to not only emulate the terminal but graphic environments like GNOM or others, and to easily exchange files with Win OS. It can be commercial, but of course the freeer the better :))

I tried to search the web - there are options, but it's difficult to figure which one is better. I browsed the forums on unix.com, but the threads are obsolete..

Any comments will be much welcome. Thanks for helping.

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