Hi !Donovan,
Right you are, my friend, and sites for that domain has been spreading the following flaws of malware: unknown html and unknown executable malware, Trojan.Generic.KD.17597, PHP/BackDoor.AR, Virus.PHP.Small!IK, 5 instances of Win32.SuspectCrc!IK, now all response dead, various IP sites for that domain were being taken down as well. So it could well have been a general domain block.
Sitevet report for the AS for that IP:
AS Name: Uninet S.A. de C.V.
IPs allocated: 12955024
Blacklisted URLs: 23
Hosts...
...malicious URLs? Yes
...badware? Yes
...Current Events? Yes
If despite of all this you might feel your website is secure, then there is an on-line contact form,
http://www.avast.com/contact-form.php?loadStyles for: * Sales inquiries; Technical issues; Website issues; Report false virus alert in file; Report false virus alert on website; Undetected Malware; Press (Media), issues.
polonus