please see this news on NSIS's webpage.
http://nsis.sourceforge.net/index.ph...D=2&tt_news=24
if you still dont believe me, NSIS is open source and you can have a look for yourself at the source code and see that it doesnt have spyware/viruses/trojans. Sorry to anyone who has antivirus software that has false positives, all you can do is report it to your antivirus software vendor and hope they fix it. Luckily none of the major anti-virus have false positives, it just appears that the smaller less known/maintained do.