Arduino Connection

I have used Arduinos before. However, when I started working on a Bluetooth project, I started having trouble connecting to it (with or without the relevant components).

Just the Arduino alone, plugged in usually results in USB-Unknown device (and you can't install the drivers for it -- says they are not compatible)

about 1/10th of the time you do get com port 23 - Arduino Uno

most of the time when you get the com port 23, it still does not appear in the Arduino IDE

The rest of the time you get various avrdude errors.

I have tried with other Arduinos, and I get the same error so I expect it's something on my computer. I have tried different USB ports (I have 3) they all seem about the same. Other USB devices work fine.

Any help would be appreciated.