I've formatted my computer because of this problem and installed Windows fresh with SP2, but my USB2 works as a USB1 still. No recent updates fixes the problem.
The problem might have occurred after having changed electrical supply to my computer. There was not a problem before this. This could point to a hardware issue, but I'm not sure.
My search on internet says that XP has the drivers and that updating should help. My motherboard driver also says that updating windows is the way to go.
What's my first approach?
Thanks for all help!