Cannot install Flash Player in Firefox

Windows Vista 32 bit
Firefox 3.6.8
I have been trying for days to install the latest version of Flash Player for Firefox but keep going round in circles.
I download the Download Manager which then prompts me to restart Firefox.
When I do, the Download Manager starts but I then get a screen telling me that in order to use a proxy I need to enter an address and a port. I am not using a proxy. If I click OK the screen reappears. If I click cancel the downlaod is cancelled.
I have tried uninstalling previous versions, but this makes no difference.
Any advice would be appreciated.

Don't use the download manager; download the installer directly from
http://www.adobe.com/products/flashplayer/fp_distribution3.html

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