Quser.com member baaadandy figured this out. Give it a try and let us know if Q tethering works for you.
Nice job baaadandy. This guy just saved many people $34 for not having to buy PDAnet.
To setup the Q:
-Enable Dial-Up Networking
-Go to Start, Accessories, Modem Link
-Make sure that "USB" is selected under "Connection"
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-Plug in the Q.
-When the New Hardware Dialogue appears, select "Install from a specific location" and point to the folder you have stored the driver.
-Clicking "Next" a few times will complete the installation.
To prevent the phone from locking up, you have to do these steps in this order.
-When you go into the "Modem Link" program, you will select Activate and then Done. The Q will return to the home screen.
-Plug in your USB cable.
-When done, disconnect the DUN connection on the computer side and wait for it to be clearly gone.
-Reopen the Modem Link program and select "Deactivate".
-The hourglass thingy will appear. Once the status reads "Inactive" select done.
-The Modem Link program will exit and now the Q will function in Activesync mode again as normal.