I just ran malwarebytes in safemode with networking and found 26 objects - got rid of them, i am also using Microsoft Security Essentials. I am only using the basic windows toolbars - no google, zynga yahoo etc toolbars installed.
Understood on this and the proxy answer. Is your system still doing this after you did the scan/clean with Malwarebytes?
Also, if you are using Internet Explorer, go into Internet Options, select the Advanced tab, and then click the Reset Internet Explorer settings button. That will restore to its default state.