Windows? Are you out of your mind?
When I use excel, it is because I'm forced to do it and I refuse to do VBA.
I have been using MAC for the past 5 years (with additional access to a Linux server somewhere in the University) and it would be hard to switch to a PC ... but trying to make sure that I would not need a PC for the course!
If I ever needed Excel, I used the MAC version of Excel... does that work well for the Excel computations done in the program?