blocked site

Our site canas-bg.com is blocked from avast.
The site now is clear.
How i can solve the problem?

thank you in advance

If your site is really clear again, you can report it as FP here:
http://www.avast.com/contact-form.php?loadStyles

Site seems clean: SOSWebScan: Your site URL -http://canas-bg.com has been successfully scanned. And No Malware or badwares found.
The site does not use cookies on the StartPage; Site server gives away the “X-Powered-By” HTTP Header, remove that, SpamCheck OK, GoogleSafeBrowsing: OK, G-Rated / Child Safety: OK
Safe; sucuri scan: clean. Clean results also here, see: http://monkeywrench.de/result.html?id=3805544&displaykey=71722134

Now (possibly past) issues found:

Google Safebrowsing: It seems that canas-bg.com in functioned as an intermediary to infect 1 site: , see: vassight.com/.http://safebrowsing.clients.google.com/safebrowsing/diagnostic?site=vassight.com/

unmasked parasites:
This link is questionable: http://www.google.com/safebrowsing/diagnostic?site=www.keyholders-bg.com
Malicious software includes 4 exploits. Successful infection resulted in an average of 1 new process on the target machine. MSIE ADODB.Stream Object File Installation Weakness,
still here, re: http://safeweb.norton.com/report/show?url=raapearls.net

Malicious software hosted on 6 domains, e.g. raapearls.net/, macitozcan.com/, fethiyecarrental.net/. (two other sites not scanned by NSW), also see:
http://www.urlvoid.com/scan/macitozcan.com (Malicious software includes 80 exploits)…

1 domain seems to function to spread malware to visitors of this site (canas-bg.com), e.g. macitozcan.com/.

This site was hosted on 1 network including AS39388 (OTEL).

polonus