Hi,
You didn’t mention about which O/S release ? Because I’ve installed EM7455 on X220T running Windows 7 Pro 64 bit and I do install latest “Sierra source” generic drivers without any errors. If your T60S O/S is Windows 10 then you should install latest lenovo driver from this website: http://support.lenovo.com/my/en/downloads/ds112204 . By right shouldn’t an errors.