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browse button won't work???

For some reason I can't upload things to websites anymore. what happens is that I click the browse button on a website (like instructables to upload a picture) and nothing happens, I can't find the browse window anywhere. I've looked through my internet options and turned all my firewalls off and it still wont work. can anybody help me fix this???? I am running Windows XP and my browser is the latest version of Firefox.

It happens sometimes, close and re-open firefox, sometimes you'll have to restart the computer aswell...
. If that doesn't work, I'd try uninstalling FF, clean the registry, and re-install FF. . Can you browse using IE or some other browser? If none of them work, you may need to re-install Windows.
It's just a problem, I believe it to be a simple process overlap somewhere along the way... Granted cleaning FF's registry is good practice as all those spyware attempts mess it up a little...