Hello, try these free programs to scan for malware, which work with your existing antivirus software:

try all programs because each one detect different malware

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• Anti-Rootkit Utility - TDSSKiller
• AdwCleaner (for more info, see this alternate AdwCleaner download page)
• Hitman Pro
• ESET Online Scanner

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.

also, what you have in Event Viewer ?

thank you

JJStillPatientlyTrying said

I am using Firefox version 18 on my HP PC. When I try to open it, I get the message: "The application failed to initialize properly (0xc0000005). Click OK to terminate the application." I have tried to update it from the Mozilla website and, however I try, if I get as far as it seemingly to have installed, when it starts exactly the same failure occurs. I have tried to uninstall it via the control panel and absolutely nothing happens. Internet Explorer also does not work. I have tried to restore to an earlier restore point. Whichever restore point I choose, system restore fails. This occurred just after I had been installing some card design and printing software, and my AVG system warned me that it had detected and prevented infection from several Adware viruses.

Thanks so much. I just followed the first 2 steps and problem solved. Step 1: Nothing detected Step 2: No malware was found, simply 117 unused items (in the Registry?)