Firefox will only start immediately after installation, but once that window is closed, it will not open again.

Running Windows XP on Sony Vaio laptop, which seems to meet system requirements. There is no error message, nothing happens when trying to open application.

Try to use "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit) to close Firefox if you are currently doing that by clicking the close X on the Firefox title bar.
It is possible that Firefox fails to close properly and that there is a hanging Firefox or plugin-container process showing in the Windows Task Manager.
*http://kb.mozillazine.org/Kill_application

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    was Ok till recently

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