I have a USB mouse and keyboard, and I have them in my PS/2 ports because my Windows 7 does not see them in the USB-ports.
I bought a wireless Mouse and Keyboard, and they can not be seen by my computer, and they can not be in the ps/2 port.
I have no idea why not, but it would be no problem if my computer could see USB-input devices.
I bought a Wacom Bamboo tablet a few months ago, and it also won't work on my windows 7.
They all work on my other HDD, so it is not a broken USB port.
All my other USB-devices (Stick, DVD-burner, USB chargers, External HDD, Etc.)
The only things that do not work are input devices like my mouse, keyboard and pen tablet.
I hope someone can help me.