Update your bitdefender if required and run a full system scan (just to be safe).
I don't use Google Chrome but I just looked up the phishing and malware alerts and found that phishing is when someone tries to trick you into sharing information, usually through a fake website. Obviously we can assume that koptalk isn't causing the problem as nobody else seems to be experiencing it (unless it has somehow been compromised, in which case your system should be fine) which would point towards your computer being the source of the issue.
You can turn off phishing and malware alerts in the Google Chrome menu.
Menu > Settings > Show advanced settings > Untick the box next to "Enable phishing and malware protection".
However, I wouldn't recommend this as it will also turn off other malware and uncommon download warnings.
If you want to be doubly sure your system doesn't have a virus, you could try downloading AVG FREE and running another full system check.
Hope that helps mate.
Last edited by KingoftheKop; 06/08/14 09:47 AM.