Cannot install Avast

I keep getting this error message everytime I try to install Avast both online and offline. I have multiple liscences so there should not be a problem. The following is the error:

Problem signature:
Problem Event Name: APPCRASH
Application Name: instup.exe
Application Version: 12.3.3154.0
Application Timestamp: 57b5c15d
Fault Module Name: instup.exe
Fault Module Version: 12.3.3154.0
Fault Module Timestamp: 57b5c15d
Exception Code: 40000015
Exception Offset: 000802d4
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 4105

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Can someone please help me figure out why this is happening?

Without more information there is not much we can say about it.

What OS/SP ?
What exact versions of avast are you trying to install ?
Is there any other security (related) software installed ? (or was there)
etc.

It’s a Win7. And the OP is trying to install avast v12.3.3154.
What other security software do you have now or ever had?
If uninstalled, how was it removed?

See if this gives you the information you need to fix your problems:
How to Successfully Install Avast http://goo.gl/VLXde

The only other security related software installed is defender and cyberghost vpn.