If the Qdcomsvc.exe program is running on your computer, then you are infected with an ad clicking Trojan. This Trojan will constantly connect to remote sites and render them in the background. Any sites that are visited, though, will not be displayed to the user, and in most cases, the user will not even know the connections are being made. These sites are most likely being visited to generate advertisement revenue for the Trojan developer.
This article was published first at Remove the Qdcomsvc.exe Trojan & Ad Clicker
Source: Bleeping Virus