Thanks again for your comments.

I have tried installing Windoze with the USB controller disabled: Installs fine and works perfectly until the USB controller is enabled
and I have also installed with controller enabled: Installs fine until setting up hardware section then the system busy problem pops up and things slo.o.o.o.w down.

One solution that did occur to me though I don't know if it would work. If I install a PCI card USB Hub would I need to enable the USB contoller in the BIOS or would the card's controller do that through the PCI Bus? I have no experience with such cards although I know they are available. Could this be a better alternative to disassembling the PC and returning the M/B to the supplier?

Again I would appretiate your comments/advice.

Timaud