Cannot install drivers for usb devices.

[Adil Liaqat Ali]

I am using windows 7 64 bit Home Premium edition.
Whenever I connect my mouse or 3g internet usb device, the device manager shows yellow question mark and the device is not accessable.
I tried reintalling the driver but it says access denied.
I have administrator account of this computer.

I have tried doing the same thing by accessing admisnistrator account from cmd prompt.
All in vain.

I have been looking for its solution from a week.

 

[TechyInAZ]

have you temporarily disabled your antivirus?