Hi,
Not sure whether or not the anti-virus is involved, but maybe you've got some remnant of older ADR versions still lurking about. This scenario often causes install issues with newer versions.
We've begun collecting some uninstall suggestions in this thread: http://discussion.autodesk.com/forums/thread.jspa?messageID=6378911
Please let us know if any of them solve your issues.
Best,
Chris
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