This is from memory, but I've removed a few instances of this by now
Go to control panel, programs and features (or add/remove programs if you're on earlier version of Windows).
Look for Babylon toolbar in the list. If it's there, click it, then click uninstall.
Go here
http://www.majorgeeks.com/files/details/malwarebytes_anti_malware.html to download Malwarebytes and install it (it's free - but right near the end of the install, you might want to untick the "trial" option so it doesn't nag you to buy additional software.
Let malwarebtes update itself, then do a full scan (can take a while). You can then choose which bits of malware to remove (if it finds any, of course!) Post your results here if you're not sure what to do.
Reboot and check that the browser is now ok, and especially check that when you open a new tab in your browser you get the screen that you expected, and not Babylon search.
Let me know how you get on.
Ian