Input from all friends were helpful especially Ramhound's suggestion helped the most. I wanted to put it as answer here for scared of some people who might just down vote it for no reason.
Well I tested it with different variables, viz. 1. My work computer which is secured by Office Scan. 2. My personal laptop which uses office's Wi-Fi. 3. My two Hotmail accounts 4. Two browsers, I.E and Firefox. Network admins did not allow Chrome. 5. A colleague's work computer 6. A colleague's Hotmail account.
Following are search results.
- My work computer displayed results with red fonts for both IE and Firefox. I thought my account was compromised.
- My laptop in Wi-Fi does not display such weird results even when I use same Hotmail accounts.
- Then I thought Hotmail account was not compromised, might be our network admin did not want us to use Hotmail accounts for Bing. Other emails are prohibited in our office except in off hours.
- I made my colleague test in his work computer with his Hotmail accounts and no problem with him.
Following are actions I took.
- Rebooted the computer.
- Disabled all extensions.
- Cleared history, passwords, caches.
- Tried in private browsing.
- Reset I.E.
Resetting I.E. did the real work.
Thanks once again to all of you my friends. :)