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Windows 2000 Professional multiple proplems

Hi I have windows 2000 professional (service pack 5) and i am experiencing multiple problems with my computer.

I have no tool bar at the bottom of my screen and the background has disappeared and been replaced by a completely blank blue screen.

Secondly my computer keeps showing a error message that my virtual memory is too low, this keeps appearing until eventually the computer stops working and needs to be restarted.

Third problem is that the computer will not shutdown or restart unless i hold the power button in or press the reset button.

Any help in resolving these issues would be greatly appreciated

Alway useful to remember what you did last.