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Firefox closes after I click on a link to open a new window

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I had to reinstall Window 7, and of course, Firefox and Thunderbird. Now Firefox closes after I click on a link to open a new window. For example, if I'm in Thunderbird, and i click on a link in an email, Firefox gives me a message like "Firefox is already open, but must close before opening a new window."

I had to reinstall Window 7, and of course, Firefox and Thunderbird. Now Firefox closes after I click on a link to open a new window. For example, if I'm in Thunderbird, and i click on a link in an email, Firefox gives me a message like "Firefox is already open, but must close before opening a new window."

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Is there more than one installation of Firefox listed in the Programs installed?