I copied the Benq Cert to the root of the system folder (C:\) Then I executed CMD in admin mode In The command line, I executed "slmgr -ilc C:\benq.XRM-MS" After the message that the cert is installed Ok I execute "slmgr -ipk KEY" I used a Windows 7 Ultimate Key. After waiting for 30 seconds (aprox) the message said the key was inserted Ok. Then I opened the System Properties, but the message there was "activation needed". The activation runs for 10 or 15 seconds and then says there is an error. I used this same procedure with other computers and it worked well, except for a Asus notebook (AMI bios) where I had to test with various methods until the "Dynamic" method worked (SSV3 and SSV2 didn't work)