Don't know if this will help or not, but when I connect my M835 to my Win7 machine, the first thing that shows up is "CD Drive E: Mobile Partner". It has 2 folders, "documents" and "drivers".
The "documents" folder has the M835 manual in English and Spanish. The "drivers" folder has 2 sub-folders, "adb_drivers" (32 and 64 bit appear to be there) and "usbnet_deriver_win2k_xp".
I used those ADB drivers on my phone when I rooted mine.
Here's the odd thing: The "usbnet" folder has nothing but a link to Microsoft's ActiveSync.....