I came across this site through google. So much information it is a bit over whelming and confusing. I hope you can help. Please bare with me. My desktop came with WIN7 64 bit Home Premium. I went ahead and dl the .iso of WIN7 Home Premium 64 bit from a sticky post on here. I have heard this will work for me for a clean install. But I would need to use the phone to activate it. Using my key on the pc sticker. I would like to avoid that if possible and activate it online to make life easier. I took a look at the ei.cfg file in notepad. It is set to Retail. I have heard by changing it to OEM. I can install it and activate it online by using my key instead of calling. Any truth to this or is there another method involved?