Error message: Bad Image: The application or DLL C:\Program Files\Mozilla Firefox\MOZCRT19.dll is not a valid Windows image. Please check this against your installation diskette.

Question

I was in Firefox but I exited. Soon I opened it again, it
installed updates and this message showed up. I tried
scanning the file, looking at it, and everything short of
reinstalling Firefox (which every other person with this
problem has tried but it has not worked.). I installed
Firefox by USB drive, not a diskette, and I no longer have
it with me, so I can't check it from there. What should I
do to fix this problem?

Answer 1

Do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.<br />
Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.<br />
Don't remove personal data when uninstalling.<br />
It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.<br />
<br />
You can skip the step to create a new profile, that is not necessary for this issue.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
You may have a malware problem if you get unrelated pop-ups opening or are redirected to unrequested websites.
If that is the case then do a malware check with a few different programs.
Every program finds different malware, so you need to use more than one program to scan.
Do a malware check with a few malware scan programs.<br />
You need to use all programs because each detects different malware.<br />
Make sure that you update each program to get the latest version of the database before doing a scan.
* http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
* http://www.superantispyware.com/ - SuperAntispyware
* http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
* http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and [[Searches are redirected to another site]]