Am operating Windows 7, 64 bit and tried downloading addons/themes but they will not install in Firefox

I have tried downloading (successfully) addons and themes however Windows 7 tells me that there is an error and it does not recognise the software and cannot open it. Therefore am unable to change or add to Firefox. Am also using Word 2010 sxo am not sure whether or not this is causing the problem.

If you didn't install those addons directly into Firefox, use File > Open File... in Firefox to install them.

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