You'll have to install the driver if you haven't already, and then follow the instructions for your wireless to get it working with your PC. Sometimes there is a button you'll need to press on the receiver (it might be on the bottom of the receiver) while you do something else with your controller to get it started. I can remember when I first got a wireless, I got everything installed, but didn't fully read the instructions, so I missed the part about holding down that button. I mean, we're talking about me going mad for about 2 or 3 days, because I couldn't figure that part out, and most people in these forums don't use controllers.
You may also have to visit and register at http://www.Xpadder.com if you haven't already. There is a small fee to join and use the program which comes with this site, but in the long run it's worth it. This site has a long LONG list of different controllers (Microsoft, Mad Katz, Asus, etc.) that are on this site, I'm sure Logitech is also okay.
After you go through its walkthroughs (you can PM me if you have questions here) you'll have your controller working so well, it'll have more functions than the ones that come with Xboxes.