I thought maybe the delphi virus had infected my .dcu so I recompiled windows.pas that was in Delphi's C:\Program Fiels...\source\Win32\rtl\win. Here are the results.
Here's the virustotal result
I reformated my computer and reinstalled Delphi aswell. I'm using Delphi 2007.
It looks like only one of those virus scanners is picking it up. If this is the original dcu from a legitimate copy of Delphi, then you have nothing to worry about. It's just a false positive. Try reporting it to McAfee so they can update their definitions.
I am not even going to ask why you thought maybe the delphi virus had infected my .dcu :-)
Whatever your reason, don't worry too much. I uninstalled and then reinstalled Delphi and uploaded Delphi.dcu to virustotal and got the same result as you - which means that our files are identical (it said that mine had already been analyzed, so I guess it compares MD5 or such).
Bottom line - your windows.dcu is identical with a "fresh out of the box" version and one single virus checker from dozens reports something suspicious. Verdict: false positive. I will sleep well tonight knowing that this file is on my PC.