sites displaying in weird fonts

[Parangles]

I haven't deleted any fonts that I know of ,
only did a little cleaning/tidying up but a lot
of websites have started to dispay in a very illegible
casual/handwriting typeface. See screenshot. I assume Firefox is substituting
the closest font to one thats missing.
Looked in 'page source' but can't figure
what font it is/whats missing.
Thanks !

[Alaron]

Do you have this issue on any other sites besides eBay? It could just be the eBay seller using interesting fonts to jazz up his listing.

[Parangles]

Yes its on some other 'serious' sites that wouldn't be using this
font- which I just found in my fonts folder- its 'Freestyle Script"

[Parangles]

This problem is definately on this computer only.
The same sites display in a normal serif type like Times on other computers.
There is Times and Garamond and other fonts in my fonts folder.
All I did was run the register utility 'ccleaner'. What could be causing this problem of
an abnormal typeface being substituted in the browser for a common one ?