When I plug something in the front USB - Windows detects it, but after a while, it gives an error!
But when I plug it in the rear USB socket, everything is OK!
I noticed also, that when I plug my old MP3 Player (which is USB 1.1) - it works fine!
When I oppened the case, there was a low quality cable, that links the motherboard and the front panel USB. There was a label "USB 1.1" on it. It does not have the proper shielding for USB 2.0.
I tired to find one in a PC store, but the people everywhere told me, that such a cable is not for sale, and it comes with the computer case.
I decided to give it a try, and to make a shield.
1. Use aluminium foil for cooking. Slice it in ribbons, so that you can roll around the cable
2. Use black tape, to fix the foil.
3. Now USB 2.0 devices work PERFECT!
It worked for me, and I hope it will help you too!