A popup stating "XP antivirus 2012" prevents Firefox from opening

I want to open Firefox but keep getting message from "XP antivirus 2012 security center"that Firefox is infected with a Trojan and has 29 other viruses. Even when I tell this "antivirus 2012" security center I want to proceed anyway without signing up for their antivirus program, they won't let me. Have you heard of this before? Is there a way around this so I don't have to pay for this program?
I was just trying to get on the laptop for the first time since Mar. I was ironically going to update my AVG security software since it expired in May but this is the first time I've been on.

That "XP antivirus 2012" is malware itself - that "scan" is fake. Malwarebytes' Anti-Malware worked to get rid of it for ma a few months ago. <br /> [http://www.malwarebytes.org/mbam.php]

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*http://kb.mozillazine.org/mimeTypes.rdf
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How do I correct the problem causing the following error message which prevents Firefox from opening: 'The instruction at "0x10008d37" referenced memory at "0xffffffff". The memory could not be "read".'?

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-> [[Backing up your profile|Backup your profile]]
-> Now Completely [[Uninstalling Firefox|Uninstall Firefox]]
* REMOVE USER DATA AND SETTINGS
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* http://kb.mozillazine.org/Installing_Firefox
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== User Agent ==
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* Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html
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* [/questions/826858]

Possible to prevent Firefox from loading two versions of Flash, without disabling PLID scan?

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Thanks

Maybe you can check the pluginreg.dat file to see if you can disable/remove the other Flash plugin and make the file read-only to prevent changes.
You can use this button to go to the Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Issues_related_to_plugins

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Hello Cen.
You need to find an extension that blocks certain sites. I am certain there are many. Search over at [http://addons.mozilla.org addons.mozilla.org].
I hope you find it.
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Update failed something is preventing firefox from updating securely how do I fix this ?

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See also [[/questions/919214]]
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 20.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
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Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) C:\Program Files\Mozilla Firefox\
*(64 bit Windows) C:\Program Files (x86)\Mozilla Firefox\
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*http://kb.mozillazine.org/Uninstalling_Firefox
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*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

A popup stating "XP antivirus 2012" prevents Firefox from opening

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