http://blog.removevirusnow.org/adplexmedia-adk2x-com-removal/
Search for Adplexmedia.adk2x.com file and remove all of them
%Temp%\[random].exe
%AppData%\vsdsrv32.exe
%CommonAppData%\pcdfdata\config.bin
%Windows%\system32\[random].exe
%Documents and Settings%\[UserName]\Desktop\[random].lnk
Eliminate all registry keys related to Adplexmedia.adk2x.com
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\[random].exe
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\\Default_Page_URL
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system “EnableLUA” = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{2A5A2A90-3B30-4E6E-A955-2F232C6EF517} HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A40DC6C5-79D0-4ca8-A185-8FF989AF1115} “UrlHelper Class”