Hi, I'm looking to do my first completely new build here in about a week or two. I think I have everything figured out except for the os. I want to use a oem version of windows 7 (mainly for the price) but recently came across a post that said you must have access to the windows 7 opk before you can do a clean install with an oem disc. Is this true and if so what is the easiest (a.k.a cheapest) way to obtain the opk?