Help!

I've recently volunteered to start learning UNIX for the company I work for.
However as of today, I still have not been granted access to any UNIX box and thus a working Shell. I've been informed that the Editor we will be using is Vi.

They have, however, given me access to TONS of brand new books and online courses to help me learn this new cool new langauge.

My question is this: can a person donwload a working shell script editor that will run on Windows XP Pro so that I may be able to practice using the commands and scripts I am learning until such time as I have been granted access to our company's UNIX boxes?

Thanks!