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There are several viruses that disable the anti-virus program when they are launched.
There are removal tools on Symantec's website for these. You will probably need an uninfected computer to download them.
If your installation disk is new enough you may be able to boot to it and run the scan for the CD before Windows loads.
With out knowing which virus it is, it will be difficult to be very specific about how to remove it.
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“votes are collared under democracy, not by talking sense but by talking nonsense.” ~H. L. Mencken
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