Why are you using NSIS?

Here is the definition of NSIS from http://nsis.sourceforge.net/Main_Page ;

"NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers. It is designed to be as small and flexible as possible and is therefore very suitable for internet distribution."

Why are you attempting to create Windows Installers?

About that error message, the link below has details of that error message and possible ways to fix the problem;
http://nsis.sourceforge.net/NSIS_Error

Did you try those?

There's nothing supplied about your computer specifications, nor any history, so it will be difficult to offer anything other than general help.

Mark