First, disconnect all USB devices and go in the Device Manager and open the Universal...controller and uninstall all the items and in particular the Hubs and Controllers and restart. They will automatically be reinstalled fresh upon restart.
I ASSUME that you didn't install ANY of the Windows 7 32-bit drivers; meaning that you need to select Window 7 64-bit from the driver selection.
Next, after restart connect one {1} at a time each USB device. If it fails then open the Device Manager and find the {Device} in the tree and select untinstall then scan for new devices. Have ready ALL to the device drivers extracted and ready on the SSD/HDD IF Windows cannot find the correct driver and if it cannot then manually select the "Have disk" option.
The reason for Uninstall vs Update is it forces Windows to actually reinstall the device and "should" also in doing so "fix" any bad associated registry entries.
Worst case - If you okay with it then I'd first disconnect all of non essential peripherals and Clear CMOS.