I cannot download Google or Yahoo toolbars. It says Firefox could not install file there is an error 203, what does this mean and what can I do to fix it?

I have Firefox 3.6.16, I upgraded to Firefox 4 but there were many conflicts with Kaspersky so went back to 3.6.16 which is fine but I cannot get Google nor Yahoo toolbars to load. I have tried several times and the same thing happens. I have another computer that I did the same thing with but both toolbars loaded on it.

See:
*[[Unexpected installation error -203 when installing add-ons]]
* http://kb.mozillazine.org/Unable_to_install_themes_or_extensions_-_Firefox

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