Leonardo will not communicate with my computer.

I have a total of 8 hrs on this issue, scouring the web looking for a solution. the first day of using this computer I was successful in communicating with the Leonardo. Then I let the computer do a few updates and it has not worked again :0. I have tried to install new drivers and have failed. Windows 7 wants to do everything automatically. the virtual comm port driver seams to be the culprit? does anyone have a detailed solution for this. I see a lot of people having the same problems with the Leonardo and not a lot of solutions. The computer will not offer a comm port to talk with ? it says it could not find a driver for it. I just down loaded 1.0.5. I am assuming that this version would have the driver. I used numerous other versions and flashed the reset still no success.

Thanks in advance.