Anyhooo....
Just as an aside...
My PC has been running quite S L O W L Y for some time...
Decided to have a look tonight and it appeared that FireFox was using ~55% of all PC time (3GHz Pentium D - 4Gbyte RAM).
So a quick play and I discovered that it was the Skype add-on for Firefox (automatically loaded when you install Skype) that was gobbling up all the performance.
Disabled it (Tools >>> Add-ons >>> Extensions) and I have my old PC back!