Malware from this site?

[GigEm1225]

I'm using Windows 8 with Windows Defender, and anytime I load TexasCHLForum I get a warning popup saying Malware Detected. It lists "Exploit:HTML/IframeRef.AA" as the threat. The warning has never popped up on any other website. Has anyone else had this happen or know how to fix it?

[Keith B]

It may not like something from phpBB and be interpreting it as a threat. I can tell you there are no threats on this site. You may have an option in Defender to set this site as a known good site and get it to bypass the warning.