A short search on the web pointed me to this page: http://cb.vu/
, which seems to be what you seek.
Also, what would be possible if you can't/don't want to use virtualization, you can use Cygwin or MinGW, which can provide a bash like environment to a Windows computer. They're actually made for building software more easily, but all the "standard" commands of a normal bash are implemented as well... Gets close to "real" linux.
Last but not least, you can use a live distro like Knoppix, Puppy or many more of all those out there. I like to use this kind of distro, because I can use "my" OS on any computer, no matter if it's running Windows, Linux or no OS at all.
Of course, before you install or run either Cygwin/MinGW or a live distro, ask your System admin if it's OK, if you want to do it at work.
Oh, and before I forget: Have a lot of fun! That's what Linux is all about.