Application fails to start because js3250.dll was not foundFrom MozillaZine Knowledge BaseFirefox may fail to start on Windows or it may close unexpectedly with the message, This application has failed to start because js3250.dll was not found. Re-installing the application may fix this problem. You must then reinstall Firefox before it will start again. Reinstalling Firefox is only a temporary solution, since the problem is caused by malware that deletes the js3250.dll file and other Firefox program files whenever you perform certain actions, such as opening a desktop shortcut or Internet Explorer, or accessing the Control Panel, My Computer, or Windows Explorer. [1] [2] [edit] Checking for malwareLook for the file mskvtns.dll or the file ipv6monl.dll in the Windows\System32 folder and remove either file, if found. (Caution: There is a legitimate file named ipv6mon.dll.) Whether or not you find either of these two files, your system may still be compromised. You should scan your computer with an updated antivirus or spyware scanner and you should also also visit a Windows security forum, such as CastleCops Security Forums, AumHa Forums SpywareInfo forums or Wilders Security Forums, that can recommend an online scanner or specialized malware detection tools. One password-stealing trojan that causes this issue is detected by Avira Antivir and is described here. This trojan creates the system file ipv6monl.dll (among other files and registry entries) and deletes these Firefox program files:
As a temporary workaround until you can get your system cleaned, you can try making the above four files read-only. [edit] External links |
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