Licence terms are available without purchase
Type the following words into a google search: microsoft licence terms
The first result I found was link to a searchable list of Microsoft product licence terms. http://www.microsoft.com/About/Legal/EN/US/IntellectualProperty/UseTerms/Default.aspx
No one forces me to buy a brand of product, Kraft isn't the only box of Mac & Cheese in the grocery store.
Some people are receptive to suggestive sales (i.e. Would you like fries? Coke to drink?) If all she was offered was a computer loaded with a Microsoft Windows OS, is that the same as losing a bet to a buddy and you HAVE to buy the next round?
Throughout school I used Mac computers, when I was shopping for my first computer I wanted to buy a Mac. I went to a store and the salesperson showed me a Compaq Presario with Windows 98. It came with a printer and a scanner. In retrospect I feel I should have bought the Mac I went in to buy.