One suggestion which I can give is, be careful during your installation process. Try to not to chose random installation, instead chose manual installation and make sure to uncheck all that you don't need.
But even after being careful, there're some extensions getting-in like TubeItAdBlockFr extension, Feven, Savingsbull etc.
So one way is by going to the Start Menu then click on the Control Panel then on Programs, then click on Uninstall a Program and uninstall all these!
The second method which I tried to learn & done was by going to the Start menu, Right click, go to Explore, then under the Username which you use go to Local Dis(C), then click on Program Files and delete the folder's of TubeItAdBlockFr extension, Feven, Savingsbull etc completely!
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