lol, I wouldn't ever have given up my windows system that fast
Do you have any old computers around the house? You could use that to learn on, it's what I would do.
Oh, and for the business world, it's windows! Even though my servers run CentOS, I can easily say that the business world runs on Windows and that is the right choice! I know people who go around to banks on Linux setups and with permission, within 10 minutes have it broken into with a small team of people without any prior use on their systems from outside computers. This gets them over to Windows pretty fast

I'll stop here, it'll make a useless flame thread