[Firmware] Sansa Express 01.01.12 firmware released

I moved the file StMp3Rec.sys o "C:\windows\system32\drivers" then I connected the device holding the (-) button and the installation window appeared but it failed to install the device, it says something like (i’m translating from spanish) “the device couldn’t be installed because it couldn’t find the appropriate software”, I also tried to install it from a specific location but didn’t work, please help me, what can I do?