Warning of Danger at Website

It probably had to do with your antivirus/security software.

When I used to use McAfee, it used to have a shield symbol indicating the link had been checked against their list of known sites with questionable reputations.

Which security program are you using and does it still include the watch dog feature?

McAfee Total Protection

Here's a link to their Total Protection Page on their website. From there you should be able to figure out if you still have that website protection feature and get help from their support people on how to reactivate it.

http://home.mcafee.com/store/total-protection