Hi Smokestikr
Try this process and let us know if it helps any:
Reboot your PC.
Get a paperclip and push it into the little hole on the back to hard reset the controller.
Plug the 3.5mm jack end of the USB cable into your PS3 controller.
Hold the mod switch, and power up your controller (while holding mod switch).
Once the player led's stop blinking and Player 1 LED lights up, go ahead and release mod switch.
Plug USB end of the USB cable into your computer.
Does it detect now?