After installing Windows 8 on your computer (clean install, not upgrade), if you’re getting an error code: oxC004F061 when you try to activate Windows 8, it probably means that you’re using a product activation key for an upgrade version of Windows 8.
Windows 8 is available on October 26th, 2012 and $39.99 is the official promotion price for a Windows 8 pro upgrade license. But you can buy a Windows 8 Pro upgrade license for just $14.99 if you’ve just recently bought a new Windows 7 PC after June 1st, 2012.
Under normal conditions, the USB device should be recognized while it is plugged in and instantly mounted on my computer, but the message told me that MTP USB device driver was not successfully installed.
Media Transfer Protocol (commonly referred to as MTP) has been developed by Microsoft, it enables you to manage content on any portable device with storage. The MTP porting kit is part of the Windows Media Device Manager 10 SDK, includes the complete MTP specification, documentation, sample source code, software to implement a PC-based MTP simulator, and MTP test tools.