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;
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.
Ok well i have been having this problem with installing stuff onto my computer lately and it has to do with NSIS. I have been looking everywhere how to fix it and nothing has work to fix it. so i wouldnt bother sending me those numerous e how links.. im at the end of my rope and dont know what to do. but heres the error i get, like i said before i cant install almost ANYTHING, and downloading stuff, forgettabout it, they almost never dl correctly so i come here to get help. thanks, the link below is the pic of the error