Upgrade disk install windows7 enterprise free trial

[kimig1]

I am about to buy a desktop with 30 day win 7 trial. Will I have to purchase os after the trial

 

[WR2]

What else is installed on the system you're getting? Got a link for us to look at?
A 30 day trial is for..... 30 days.

You wouldn't need to buy an OS if you installed Linux. You can get that for free. http://www.ubuntu.com/