It appears that there may be a trojan slipping through the net being served over Google Ads. Although this site isn't being specifically targeted, some of the infected ads appear to have been displayed here on P&PG. If you have an antivirus program installed, chances are you are protected. If not, you should update your virus software and do a full scan. It seems that the virus that is being sent through these ads is called "mebroot," and any site that is currently serving Google Ads may display an infected ad. As a result, I have temporarily removed Google advertising from this site entirely.
For all other sites, browse safely my friends, and have your virus program installed and up to date.