USB charges devices but they are not recognized in 'my computer'

I have a A135-S2356.
It has 4 USB ports, only 3 are visible in device manager.
Only 1 charges/sees my device....iphone charges, laptop external fans runs, external hard drive lights up, but nothing is recognized in 'my computer'
I get an error message when i plug anything in to the other 2.
I have tried uninstalling them in device manager and rebooting but they still don't work.
I am not very technical so i am completely stumped at this point!
Any ideas?
Thanks in advance

See Jeff's reply and links here for some ideas...
Thread: computer not seeing iPod
http://discussions.apple.com/thread.jspa?threadID=876145&tstart=0
Patrick

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