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I am trying to install Haskell-2012.4.0.0.exe on my computer running windows 7.

When I run the installer I get the following message and the installation fails,

Installer integrity check has failed. Common causes include
incomplete download and damaged media. Contact the
installer's author to obtain a new copy.

More information at:
http://nsis.sf.net/NSIS_Error

How do I fix this issue and get it to install?

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The error message suggests what is wrong - incomplete download and damaged media; Get a new copy! For what ever reason, it may appear that your download was not successful (maybe your internet connection dropped during download). So, re-download the installer and then try to install again.

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I used the same installer to install it on another machine running windows 7 and it worked without any issues. – Ishan Apr 18 '13 at 6:27
    
Well, if you've tried again to install it and it still fails then consider your firewall or AV or any other similar programs (or even permissions) – Dave Apr 18 '13 at 8:09
    
I have been able to install haskell successfully. I found that changing the usb I used to copy the haskell setup installer from my computer to my usb to install on another computer fixed the issue. It seems that when I am copying the file to the usb, that it is not completely getting copying. – Ishan Apr 20 '13 at 4:44
    
You didn't mention this in your original post :-) – Dave Apr 20 '13 at 5:33

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