Is it a desktop computer? Do you have a front and rear mic port? If so, try switching to the other port. __________________________________
CORNBLOSSOM

Hi, Go4peace!
In the event that your Power Director is not "recognising" your microphone, I admit I've not yet seen one that connects via USB, but if you have a "third-party" software for audio-only recording & editing, try your mic with that software, and if it works okay, then my post on adding narration to video may help. In the event that it doesn't work, then the front or rear panel microphone inputs on your computer will happily accept any analogue microphone, as long as the plug is the right size(miniature phone plug). Even microphones like that from that old cassette recorder you might have, gathering dust in your attic(or cellar), or that old beast of an open-reel recorder you used as a kid. If they're still working, plug 'em in to the mic socket on the front of your computer. One tip, get yourself a microphone sock. This is a foam-rubber cup that covers the business end of the microphone and helps to cut down heavy "sylibant" sounds( such as "p' in potato). You'll even find your Power Director software will accept the signal from this trusted veteran technology too.

Hi. Thanks for the replies. I ended up buying PD 12, which works fine with it. I tried standard mics in the mic input etc, but nothing seemed to appear in the audio input menu, so I figured I wouldn't solve it. Thanks anyhow folks.

Hi, go4peace. Good that you've resolved your problem through upgrade to PD12, but a tip for the future if you ever require the use of an analogue microphone, it's always best to connect such a microphone through an audio mixer. I use a second-hand "Realistic"(Tandy) SSM-1900, which I found at a recycling centre. It has two microphone inputs, two phono(magnetic cartridge) inputs, 4 line inputs(for cassette and/or open-reel recorder output, CD player, or any other line-level source) and has two line-level outputs, one for the monitor(connected to the Aux. input of a stereo amplifier, and the other, to my computer via the line-in socket at rear of the CPU. The output of the mixer going to the amplifier, actually goes via a 3-way source selector switch(again made by Realistic) so I can select wither what the computer is "hearing" or what signal is going to the computer via the mixer's monitor output.
It's an elaborate set-up, yes, but it works for me.. You could set up a simpler arrangement, but to get the signal "recognised", you must select the input by clicking on "device", then, from the drop-down menu, select "Line-In At Rear". This will get around the system not recognising the front-panel microphone input on your CPU.
Cheers!