I tried the adb drivers linked above and they didn't help me. Not to be deterred, I kept poking around and found these posted on xda...
http://forum.xda-developers.com/showthread.php?t=2217396This has fixed an issue where although my files synced, the "remove those not in the sync list' setting was not working.
After installing these two packages, and connecting my phone, Windows first said that driver installation had failed. Disconnected and reconnected, and I'm now good to go. The delete files setting is working and my phone is no longer defaulting to 'debug' mode when connected.
Might work for you too?
I made a concious decision to trust the guy posting the executables after reading the entire thread and some of his history on xda.
Note that even though I had the HTC Sync Manager installed previously, which is supposed to include the drivers that CNexus has posted, my phone still did not work correctly with MC. I removed the HTC Sync software and moved these two in. All is good now.
-marko