One of the things I have found when installing new Os's is that
sometimes you end up installing two sets of virus protection
software without realising it. When this happens they can conflict
with each other and as the system boots and they start up in the
background they slow everything down as they compete with each
other.

May not be your problem but worth eliminating as a factor?

George MacIntyre
George MacIntyre
Computing Support Officer
Edinburgh University
Medical Education Centre
3rd floor Out Patients Department
Western General Hospital
Crewe Road
Edinburgh
EH4 2XU
TEL: +44 (0)131 537 1496

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