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latest version of Flash Player won't install on Wind. 7 w/ firefox

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have downloaded new version of adobe flash player but it will not install. I get a box that says "only a single instance of this application can run" What does this mean/what do I do about it? (I've removed the old flash player)

I am using a HP desktop w/ Windows 7 64-bit.

have downloaded new version of adobe flash player but it will not install. I get a box that says "only a single instance of this application can run" What does this mean/what do I do about it? (I've removed the old flash player) I am using a HP desktop w/ Windows 7 64-bit.

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You seem to have Shockwave Flash 11.1 r102 installed, according to the plugins scan done on the browser that used to post in this forum.