There appears to be some problem with 2 of my browsers:
1. Internet explorer - suddenly opens a popup with some junk advertising website. Also, on the page that I am browsing, add banners show up in weird places
I checked in the add-ons section for toolbar & extensions and there are two that i am unable to disable - AdBluoccknWatch and DDOwnaloadd keepeer.
2. Chrome - keeps going into a 'not responding mode' or freezes for some time before it continues. It does not show any junk, but has just become very slow suddenly.
Virus scan (microsoft security essentials) was fine, and OS is on automatic updates.