[Hypnotic2010]

Opera 10 usually does it automatically for me too, but if it doesnt you can try this...

Setting to change the link for your internet globe...

Here goes:
HKLM\Software\Microsoft\Shell\Rai\DEFBROWSER\1 -CHANGE the string from "windows\OperaL.exe" to whatever you want.
Let me know if this works for you.