Hello Raist, welcome to Seven Forums!
Just be advised, an OEM version can only be used on a single PC and can never be moved to another machine as it will only recognize the first motherboard it is installed to.
An OEM version lives and dies with the first mobo it is installed to.
You may be better off with an upgrade version, have a look at this tutorial at the link below and be sure to post back with any further questions you may have and to keep us informed. Do a Clean Install with a Upgrade Windows 7 Version