Switched the laptop on and this is acting as a search engine

Have you been going on naked girl websites?
Yano, the ones with their babylons out and what-not.

Uninstall it via addons in ff, then delete it in add/remove progs via control panel.
ProgramFiles\Mozilla Firefox\searchplugins and delete the entry in that folder also.

Then search this "keyword.url" right click the value (babylon url you can see) hit modify and put this in it's place "http://www.google.com/search?q="
Last step is to type "about:config" into ff, in the search at the top type "babylon" and delete (reset) all entries.


You should now have got rid of it. Run a registry cleaner after maybe.