system
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I ran Spy Emergency, which is a free trojan removal tool (15 day fully working trial) and observed it scanning the several instances of winlogon.exe with the counterparts it was loading and that passed cleanly. Since the computer seems fine and all other virus checks are fine, I am going on the assumption that the Avast memory scan produced a false positive.
Thanks for the help and for pointing me in the right direction. It may be a good idea for those of you involved in problem resolution check out Spy Emergency to see if it would be a good tool.