Whenyou plug your wildfire in, up in the top left hand corner(on the notification bar) you should see two little icons pop-up, One will be telling you that you have connected your phone to a power source and it is now charging, the other allows you to turn on usb file transfer.
Drag down you notification bar and click the one that says something like "file transfer" and it should open a new window... there should be a button at the bottom of the page which allows you to toggle the file transferring on and off, remember to turn it off before you take your phone out, or it will bug the next time and you'll have to reboot your phone and your pc to get it working
Hope this helps,
You could also try to reinstal the drivers a few times
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