If you (like me) have tried clicking ‘Make Google Chrome my default browser’ in options > basic with no result, you’re probably as frustrated as I was.
If you’re running Vista, it’s simply a privileges issue, you need to -
- Close Chrome
- Right click the Chrome shortcut and select ‘Run as Administrator’
- Accept the warning about running as administrator
- Go to options > basic (as before)
- Press the ‘Make Google Chrome my default browser’ button
This time it should work 
You can now close the browser as administrator and launch it again with your normal user credentials.
On a side note, if you are having trouble making Skype aware of Opera as your default browser, this may help.
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