It could be a case when you may see some additional adware toolbar like ask toolbar, yahoo toolbar which keeps making the reading view of internet explorer limited, on the other hand eating away your internet bandwidth too in the background.
All these adware toolbar and browser helper objects can be really dangerous sometimes, as these browser objects steal your browser habits and steal the users silently, some of the malware browser helper objects can slow down your computer also in some cases.
Here is how you can remove any of the suspicious browser helper objects from internet explorer.
BHORemover helps in quick identification and elimination of malicious BHO’s present in system, it displays all the browser helper objects which are currently installed in internet explorer.
All the browser helper objects are stored in the following registry key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
To remove any of the BHO from internet explorer, select it from the above list and click the button at the bottom of the program interface saying Remove BHO