I have been trying to install Postgresql server on my machine (Windows 8-64 bit 
version) but it is failing to install by throwing the following error -
"There has been an error. The environment variable COMSPEC does not seem to 
point to the cmd.exe or  there is a trailing semicolon present. Please fix this 
variable and restart installation ."

I searched some of the forums where the solution mentioned was to add an 
environment variable "COMSPEC" with the value - "C:\Windows\system32\cmd.exe". 
I did this but the issue persists. Also, there is no semicolon at the end in 
the value of COMSPEC variable.

I tried installing 2 versions of Postgresql but I am getting the same error for 
both. The versions are as follows :

1.       postgresql-9.3.14-2-windows-x64.exe

2.       postgresql-9.6.0-1-windows-x64.exe

Since the COMSPEC variable is present, it got me thinking if this is a general 
exception thrown while installing postgresql.
Also, are there any pre-conditions to be checked before installing the server. 
Could a particular software installation be hindering the postgresql 
installation (At some forums, it was suggested that the anti-virus 
uninstallation solved the issue. Could this be the reason?)

Please let me know how to resolve this.

Thanks & Regards

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