Hi, about 2 years ago I have installed windows 8 on my PC using "180 days and media center key" activation method. The version is now windows 8.1 Pro with media center and I made a backup of activation files with advanced token manager. In short I want to format my PC, if I install the OS with a windows 8.1 installation disk (without media center) and I restore my activation files, does the activation work? Or is there a procedure to follow? Thanks.