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I've tried everything from multiple forums online and nothing seems to work. The error I get says:

C:\Program Files\AVAST Software\Avast\AvastUI.exe

The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more detail.

So I ran the sxstrace.exe tool and this is what the I got from the .txt file:

Begin Activation Context Generation.
Input Parameter:

    Flags = 0
    ProcessorArchitecture = Wow32
    CultureFallBacks = en-US;en
    ManifestPath = C:\Program Files\AVAST Software\Avast\AvastUI.exe
    AssemblyDirectory = C:\Program Files\AVAST Software\Avast\
    Application Config File =


INFO: Parsing Manifest File C:\Program Files\AVAST Software\Avast\AvastUI.exe.

    INFO: Manifest Definition Identity is (null).
    INFO: Reference: Avast.VC110.CRT,processorArchitecture="x86",publicKeyToken="2036b14a11e83e4a",type="win32",version="11.0.60610.1"

INFO: Resolving reference Avast.VC110.CRT,processorArchitecture="x86",publicKeyToken="2036b14a11e83e4a",type="win32",version="11.0.60610.1".

    INFO: Resolving reference for ProcessorArchitecture WOW64.
    INFO: Resolving reference for culture Neutral.
        INFO: Applying Binding Policy.
            INFO: No publisher policy found.
            INFO: No binding policy redirect found.
        INFO: Begin assembly probing.
            INFO: Did not find the assembly in WinSxS.
            INFO: Attempt to probe manifest at C:\WINDOWS\assembly\GAC_32\Avast.VC110.CRT\11.0.60610.1__2036b14a11e83e4a\Avast.VC110.CRT.DLL.
            INFO: Did not find manifest for culture Neutral.
        INFO: End assembly probing.
INFO: Resolving reference for ProcessorArchitecture x86.
    INFO: Resolving reference for culture Neutral.
        INFO: Applying Binding Policy.
            INFO: Find publisher policy at C:\WINDOWS\WinSxS\manifests\x86_policy.11.0.avast.vc110.crt_2036b14a11e83e4a_11.0.60610.1_none_b2556b4035446b41.manifest
        INFO: Begin assembly probing.
        INFO: End assembly probing.

ERROR: Activation Context generation failed. End Activation Context Generation.

Anyone knows what this means?

This is my first post here so I'm not really sure how the formatting works, I hope it's legible. Thanks for any help, appreciate it :)

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Open your Control Panel\All Control Panel Items\Programs and Features console and check if Avast is in the list of the installed applications. If not, then you need to re-install Avast. If it's listed there, then you need to install Visual C++ Redistributable for Visual Studio 2012 (VC110 is a code for C++ Visual Studio 2012). You can get it from here: Visual C++ Redistributable for Visual Studio 2012 Update 4

Make sure you install x86 and x64 versions side by side - note, you only can install x64 on a 64-bit Windows OS, so if it fails to install x64, then just skip that (no harm done).

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