RE: Windows 8 Dell inspiron 7520 installation problem
The activation key will not match the key that is embedded in the motherboard. And if it doesn't say System Builder on the box, it is not the OEM version, no matter what the store clerk said. The system builder version is for empty disks and looks like this-- http://www.amazon.com/Windows-Professional-System-Builder-64-Bit/dp/B0094NXBZ0/ref=sr_1_2?ie=UTF8&qi...
Order the Dell disk and save a lot of headaches. If you are not in the US you have contact Support in your country.
Update--There will be a full version of Win 8.1 available when that version is released.