Hi.
I found this with google over the site transformerforums.com /forum/guides-tips-tricks/34852-how-solve-mtp-issues-all-android-devices
(I`m not allowed to post links here)
And i went into Settings > More > Application Manager > All
Look for Media Storage, and clear the data.
Look for MTP Application, and clear the data.
After that, just to be sure, I restarted the device, and... (only after it all I realized I left the phone pluged on the PC, and seems not to make a difference).
After phone boot up, I unpluged and pluged back in, and all drivers installed the right way.
I hope it help some of you guys. :fingers-crossed: