assuming that AVG is some anti-virus software, and AVG erroneously reports Pd as malware, than i thikn that you should report a bug-report with AVG (so they can reduce their false-positive count)
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This has come up a few times. Only AVG seems to think its a virus:
http://lists.puredata.info/pipermail/pd-list/2010-04/077708.html
You can try another anti-virus to be sure.
assuming that AVG is some anti-virus software, and AVG erroneously reports Pd as malware, than i thikn that you should report a bug-report with AVG (so they can reduce their false-positive count)