Problems on that IP/ASN: http://urlquery.net/report.php?id=1428655682117 http://urlquery.net/report.php?id=1428655972578
DNS problems: http://dnscheck.pingdom.com/?domain=gce-bg.zettahost.bg
Blacklisted: http://multirbl.valli.org/lookup/83.125.22.169.html
IFrames used (security risk): http://quttera.com/detailed_report/gce-bg.zettahost.bg
No doctype specified and other website programming errors: http://validator.w3.org/check?uri=gce-bg.zettahost.bg&charset=(detect+automatically)&doctype=Inline&group=0
If you believe everything is fine, ask avast to review the website : https://www.avast.com/contact-form.php?subject=VIRUS-FILE