What virus scans have you run? Re-installing windows may be unnecessary...
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All census look up transcriptions are Crown Copyright ====================================== Brown 1800 Dover -> Woolwich (Kent) Barnett 1800 Isleworth -> Woolwich Pannifer 1830 Suffolk -> Deptford Kent Brierley in Staffordshire(Pre-1875) Walters in Middlesex(Pre-1875) Clift,Gould in Devon/Cornwall
Assuming the thing will actually start up, it might be a good idea to press Ctrl+Alt+Delete to bring up Windows Task Manager, then click on the Processes tab. This should show you what is using the computer's resources and slowing it down . . . in the "CPU" column, the number shows the percentage of time being used by each process. If you write down the names of the items with the highest numbers in that column, you can google them and find out if they are virus related.