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Hi Wave Avenue,
It's hard to say. Typically these are false readings. It could just be his virus/malware software. It's good to check your site on "Site Warning" sites like McAfee Site Adviser, etc.... To say whether or not it will affect your site, depends on how many are getting these warnings, and whether or not they are reported on sites like McAfee Advisor. I just checked and you have a clean bill of health on the McAfee site:
This is one of those you may want to submit to Ning Support and see if they can assist.