Have you ever had occasion to do a Repair Install or a clean install of Windows Vista? Did you intentionally choose to install ffmpeg.exe for some reason?
Please answer each of the following admittedly tedious diagnostic questions in a correspondingly-numbered list in your very next reply, preferably without quoting my post: 1a. When (approx.
Why not return null? 
A value of -1 is a valid result of popping from a stack of integers.
Date) did you purchase the computer? Who manufactured the computer (e.g., Dell; HP; Lenovo; Toshiba)?
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Is it a Vista 32-bit or a 64-bit computer? Have you ever had occasion to do a Repair Install or a clean install of Windows Vista?
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Did you intentionally choose to install for some reason? What is the full name of your installed anti-virus application or security suite and when (approx. Date) does your current subscription expire? What anti-spyware applications (other than Defender) are installed? What third-party firewall (if any)?
Has a(nother) Norton application or a McAfee application EVER been installed on the computer since you bought it? Did a Norton free-trial or a McAfee free-trial pick one come preinstalled on the computer when you bought it? (Doesn't matter if you never used or Activated it.) 5. Is KB3216775, KB3203621, KB3210142, KB3204724, KB3196348, KB3204808, KB3196726, KB3204723, and/or KB3203838 listed in Installed Updates ( not Update History)? Assuming Java is installed = Is Java Version 8 Update 111 (or higher) installed?
TEST HERE USING INTERNET EXPLORER ONLY! = 2. Java Update: Patch it or pitch it. Is it time to disable/uninstall Java? Is Adobe Flash Player v24.0.0.194 (or higher) installed?
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TEST HERE USING INTERNET EXPLORER ONLY! Assuming IE9 is installed = What Update Version & KB number are displayed in the second line of text in IE9's Help About Alt+H+A tab; e.g., Update Version: 9.0.54 (KB9876543)? Is Firefox version 50.1.0 (or higher) and/or Google Chrome version 49.0.2623.112 sic or any other alternate browser installed?
Are you in the habit of using 'Registry cleaners' (e.g., Registry Mechanic; System Mechanic; RegCure; RegClean Pro; Advanced SystemCare; Total System Care; Glary Utilities; Registry Booster; McAfee QuickClean; AVG Quick Clean; AVG PC TuneUp; Norton Registry Cleaner; Norton PC Tuneup; PCTools Optimiser; SpeedUpMyPC; FixMyPC; PC Doctor; TuneUp Utilities; WinMaximizer; WinSweeper; Comodo System Cleaner; Advanced System Optimizer; CCleaner Registry Cleaner component)? 1 Start Control Panel Programs and Features View installed updates (in left-hand menu) 2 No need to install Java if it's not already installed! I cant find the person that gave me the answer but here is what I did went to mozilla and reinstalled latest version of Firefox. This seems to have cleared the problem of ffmpeg.exe has stopped working on Vista laptop. It was the simplest to try so I did. Thanks everyone.