Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

instruction at 0x00ac1aa4 memory cannot be read

  • 3 ŋuɖoɖowo
  • 1 masɔmasɔ sia le esi
  • 9 views
  • Nuɖoɖo mlɔetɔ Matt396

more options

I have a computer in my shop that has firefox that will not start at all, not even in Safe mode. In normal mode of Windows 8.1 Firefox will not start at all. Going into Winows Safe Mode with networking is a little more revealing. I get the error Instruction at 0x00ac1aa4 referenced memory at 0x00000000 the memory could not be read. What is causing this error?

I have a computer in my shop that has firefox that will not start at all, not even in Safe mode. In normal mode of Windows 8.1 Firefox will not start at all. Going into Winows Safe Mode with networking is a little more revealing. I get the error Instruction at 0x00ac1aa4 referenced memory at 0x00000000 the memory could not be read. What is causing this error?

All Replies (3)

more options

no one knows?

more options

Make sure that you have the latest updates for your security software and all major system drivers (graphics display, mouse, etc.).


Do a malware check with several malware scanning programs on the Windows computer. Please scan with all programs because each program detects different malware. All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

You can also do a check for a rootkit infection with TDSSKiller.

See also:

more options

Problem was fixed by a FireFox reinstall