Constant Firefox Errors.

[Coldplay]

So when I'm not being told that the 'Address Not Found' I'm getting stupid page errors like this;

http://uploadpicz.com/images/3D78HQW.jpg

How to fix?

[Monopoly]

hate to state the obvious but...

have you cleared everything?
and reinstalled it?
and restarted your computer? and modem?

[Coldplay]

Brand new PC, Just downloaded FF. Errors also happened on my old pc.

Using different OS, everything is different.