Ok, I know the issue now:
Your PHP is insecure. Update and secure your PHP on your web server.
Update apache as well. Make sure you are current.
Here is a list of the AdWare people and their IP's:
http://www.webhelper4u.com/CWS/cwsbyalphanumeric.html
Notice if you copy the first three parts of an IP and search elsewhere
in the list you will find many domain on the same class C? Voila.
Happy hanging.