Do you mean you have downloaded and installed each one or have them available in a downloads folder?
You should only run one AV program, as you seem to infer. If you have installed all of them then skidzy's suggestion about Add/Remove should be followed (also check whether any Uninstall feature is detailed from Start>Programs rather than Add/Remove).
If you have just downloaded them then you only need to Delete each unwanted download in the normal way.
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