The display on the onbpard ATI Radeon grahics system stared shaking and
flashing badly, and would not allow resizing or changing of colour depth. It
would allow changes in safe mode, but this caused the PC to hang with a black
screen on boot up. I restarted in safe mode and removed the ATI drivers, then
used a new PCIe-16 Nvidia graphics card.

When running the CD, I got the message that Windows could not load the
installer for Display. I booted from the CD and chose to repair the existing
Windows installation (the screen after accepting the EULA), and all went well
until being told that setup could not copy three files. Sorry but I didn't
note the first two but the last one was desk.cpl. Needless to say, the
problem remained when setup had completed.

If I right-click the desktop, and choose properties, nothing happens, but I
can start the properties box by running desk.cpl

The settings window in desktop properties shows 1024x768 resolution, but
just says Default moniotor on...

Any ideas please?