Firefox does not open but there is an entry in Task Manager

I've tried upgrading my gf's firefox from 3.6 to 5.0.1
Since then, whenever I click on the firefox shortcut on the desktop, nothing happens. There is an entry in the Task Manager but nothing else happens.
I've tried uninstalling and reinstalling FF, even trying 4.0.1 to see if that works but I get the same problem there. Which is what leads me to believe it's a software conflict...the problem is I can't identify what it is and why it only stops versions from 4 upwards!

Launch the Console application by entering the first few letters of its name into a Spotlight search, and look under "User Diagnostic Reports" for crash logs related to Safari, WebProcess, or PluginProcess. Select the most recent one and post the contents -- the text, please, not a screenshot.
Starten Sie die Konsolenanwendung (Console), indem Sie die ersten Zeichen seines Namens in eine Scheinwerferrecherche und in Blick unter „Benutzer-Diagnoseberichte“ für die Systemabsturzlogs eingeben, die auf Safari, WebProcess oder PluginProcess in Verbindung gestanden werden. Wählen Sie das neueste aus und geben Sie den Inhalt bekannt -- der Text, bitte, nicht ein screenshot.

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