I uninstalled Firefox and tried to reinstall it back in using the stub installer first and it failed, So i downloded the full Installer and tried to install that but it fails as well. It extracts but then shows error message that "Firefox Installer failed to work" This is the log i got : instance of Win32_NTLogEvent { Category = 100; CategoryString = "Application Crashing Events"; ComputerName = "CharvinSoft"; EventCode = 1000; EventIdentifier = 1000; EventType = 1; InsertionStrings = {"setup.exe_Firefox", "1.0.0.0", "54336eba", "vrfcore.dll", "6.3.9600.16384", "52158fd0", "80000003", "00003466", "1bd0", "01d0c2e70befe0d8", "C:\\Users\\Charvin\\AppData\\Local\\Temp\\7zSFB3.tmp\\setup.exe", "C:\\Windows\\SYSTEM32\\vrfcore.dll", "4c8c7a72-2eda-11e5-9a3f-3c970e835e69", "", ""}; Logfile = "Application"; Message = "Faulting application name: setup.exe_Firefox, version: 1.0.0.0, time stamp: 0x54336eba \nFaulting module name: vrfcore.dll, version: 6.3.9600.16384, time stamp: 0x52158fd0 \nException code: 0x80000003 \nFault offset: 0x00003466 \nFaulting process id: 0x1bd0 \nFaulting application start time: 0x01d0c2e70befe0d8 \nFaulting application path: C:\\Users\\Charvin\\AppData\\Local\\Temp\\7zSFB3.tmp\\setup.exe \nFaulting module path: C:\\Windows\\SYSTEM32\\vrfcore.dll \nReport Id: 4c8c7a72-2eda-11e5-9a3f-3c970e835e69 \nFaulting package full name: \nFaulting package-relative application ID: "; RecordNumber = 598524; SourceName = "Application Error"; TimeGenerated = "20150720122443.000000-000"; TimeWritten = "20150720122443.000000-000"; Type = "Error"; }; Now I'm using Comodo Ice dragon as it got installed in somehow.