Screen freezes on an option-less gray screen everytime on launch; re-install does not help

I am on a Windows 7, 32 but machine. While closing one of the tabs on FF14, I got this gray screen which has been persistent since then. It was not a crash, and hence I do not see any crash reports in the appropriate folder.
I uninstalled this version (without removing user data), and installed 16, which behaves same. I do not get any options to start in safe mode - just a semi-transparent gray screen with (minimize/maximize/close) buttons.
Everything was running smooth, and I am quite sure it's not because of any plugins. I need to preserve my user data - how should I proceed ?
Thanks !!

hello dpux, [https://support.mozilla.org/en-US/questions/940393#answer-377118 from another user] we found out that this might be related to malware active on your pc. please close all firefox windows and try [[Troubleshoot Firefox issues using Safe Mode|running firefox in safemode]] (by pressing the shift key while you're starting it). in firefox safemode go to firefox > addons > extensions and remove the entry named "Codec v1.0" or any other addons that look suspicious & you have not installed intentionally. afterwards see if you can run firefox normally again...
please also do an in-depth scan of your system with the security software already in place and/or a different tool like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & keep firefox and your plugins up-to-date in order to stay safe on the web.
[[Troubleshoot Firefox issues caused by malware]]
[[Update Firefox to the latest version]]
https://www.mozilla.org/plugincheck/

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