Can not install USB drivers

I'm running windows seven home edition. I currently get "The Board at COM1 is unavailable." Error when trying to connect to my Arduino Mega2560. I manually installed both USB and USB Port drivers. The port drivers show a code 10, Error this device cannot start. Need to get some idea of how to proceed.

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Your board is NOT on COM 1.

Sounds like you may have a clone board if that is the only board listed in device manager.
In which case you need these drivers