Hi, I am using version 3.6 and when I open a new tab another tab automatically opens at random and points to pages like http://www.petroledair.com/index.php/travel

Sounds like you may have picked up some Malware. Install, update, and run these programs in this order. '''''(Not all programs detect the same Malware.)''''' They are all free for personal use, but some have limited functionality in the "free mode" - but those are features you really don't need to find and remove the problem that you have.<br /> ''Note: If your Malware infection is bad enough and you are mis-directed to URL's other than what is posted, you may have to use a different PC to download these programs and use a USB stick to transfer them to the afflicted PC.'' Malwarebytes' Anti-Malware - [http://www.malwarebytes.org/mbam.php] <br /> SuperAntispyware - [http://www.superantispyware.com/] <br /> AdAware - [http://www.lavasoftusa.com/software/adaware/] <br /> Spybot Search & Destroy - [http://www.safer-networking.org/en/index.html] <br /> Windows Defender: Home Page - [http://www.microsoft.com/windows/products/winfamily/defender/default.mspx]

Thanks a lot. I will follow your advice. Ashish