Sounds like you're perhaps missing a driver that was present after the upgrade but is no longer there after you did a fresh install.
- right click on Start Menu
- select Device Manager
- see if anything in the Device Manager window has a yellow exclamation mark next to it
- if so, try searching for a driver or post a snapshot of the window and post back here
Also, please list all devices you have plugged into any and all USB ports - mouse, keyboard, printers, dongles... ect.