I have a Dimension 8200 with 5 ea. 1.1 USB ports. What do I have to do to convert to high speed 2.)
Probably your motherboard doesn't support it, which means you can't upgrade. Sorry. That is an old desktop.
You can get a PCI card with USB 2.0 ports, such as this one -> http://www.newegg.com/Product/Product.asp?Item=N82E16815153001