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#11
So, after 24 hours trying to resolve this issue I elected to reload Win 7. HDD formatted, Win 7 reloaded followed NIS 2011. Windows security centre now running quite happily, as is windows defender. No warnings now being flagged up to me. Should have taken this route some time ago - it only took me 2 hours to reload everything and the system is much quicker also :)
Thanks for everyones help.
DA