Hello all ! Firstly I am sorry for this thread if i have not post in the right place and secondly I am sorry from my bad English. Here is my problem: In about two days shall i get a new Laptop HP DV7-6185US from USA and will come with an Windows 7 Home Premium x64 SP1. I need a DVD to reinstall Windows when I want with a clean install and I have downloaded a MSDN copy of Windows 7 Home Premium x64 SP1 because is a untouched version but I know that this version will not work with my key sticker (OCA) and if will work with the key i cannot activate them. From reading this forum i have learned that is a file named ei.cfg that i need to change Channel from Retail to OEM but I am not sure if this will work at all. Probably I need a folder called $OEM$ with some files but i am not sure. I need a clean DVD with only needed files to complete activation process with my key..Here is a photo with iso that i have downloaded from MSDN. If some of you can help me with this problem i will be very happy ! Good Day !