FF 21 constantly crashes Win XP SP3

Question

For over a year now (since version 13 - I think) I have had to stop using FF because it crashes upon start-up. Ever once in a while, I uninstall it and install the latest version (currently have 21) and what happens is when I start it up for the first time, I am able to use it. But once I close the program and start it up again, it just crashes upon start-up every time. So, I cannot use FireFox on my system at all.
Even though in the past hour I have tried opening FF 21 over 20 times, there are no crash report logs to be found in my application data folder for FF.
Please help me troubleshoot and fix this issue.

Answer 1

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
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