You may have seen a warning screen like this recently at PDGA.com. Over the weekend, previously unknown security vulnerability in the adserver used at PDGA.com was exploited and lead to Google listing the website as malicious. This vulnerability has been corrected and Google is currently reviewing the website. We expect this process to be completed within the next 24 hours.
As a precaution we do suggest that users scan their computer for potential malware. If you don’t already have a malware scanner there are several free versions available. We suggest either Malwarebytes’ Anti-Malware (http://www.malwarebytes.org/mbam.php) or Avast Antivirus (http://www.avast.com/free-antivirus-download).