Hang on, you keep saying about some kind of cabinet your pc is in. It's not some giant metal faraday cage blocking the signal is it? Also, what are you using to test the bluetooth? a foot doesn't sound like much but it really depends on what you are doing/using.
Can you go to your device manager, find your bluetooth module and reset the driver?
When you uninstall and then restart your pc, it should do a fresh driver install on startup. Obviously this will be tricky if your mouse and keyboard is bluetooth and turns off though, so use a usb keyboard if you need to.
Can you go to your device manager, find your bluetooth module and reset the driver?

When you uninstall and then restart your pc, it should do a fresh driver install on startup. Obviously this will be tricky if your mouse and keyboard is bluetooth and turns off though, so use a usb keyboard if you need to.