Not sure why? Haven't used NSIS yet. I installed NSIS on 1/4/09 and Bit defender scans every night. Here's some info from the log file:
Resolved issues:Object Name Threat Name Final Status
C:\Program Files\NSIS\Stubs\lzma_solid Trojan.Generic.1328988 Deleted
C:\Program Files\NSIS\uninst-nsis.exe Trojan.Generic.1328988 Deleted
C:\RECYCLER\S-1-5-21-357464061-516276246-1282138258-1007\Dc22.exe Trojan.Generic.1328988 Deleted
C:\System Volume Information\_restore{21D7D692-4662-421F-93B0-877BC3820711}\RP2237\A0108544.exe Trojan.Generic.1328988 Deleted
C:\System Volume Information\_restore{21D7D692-4662-421F-93B0-877BC3820711}\RP2237\A0108545.exe Trojan.Generic.1328988 Deleted
Resolved issues:Object Name Threat Name Final Status
C:\Program Files\NSIS\Stubs\lzma_solid Trojan.Generic.1328988 Deleted
C:\Program Files\NSIS\uninst-nsis.exe Trojan.Generic.1328988 Deleted
C:\RECYCLER\S-1-5-21-357464061-516276246-1282138258-1007\Dc22.exe Trojan.Generic.1328988 Deleted
C:\System Volume Information\_restore{21D7D692-4662-421F-93B0-877BC3820711}\RP2237\A0108544.exe Trojan.Generic.1328988 Deleted
C:\System Volume Information\_restore{21D7D692-4662-421F-93B0-877BC3820711}\RP2237\A0108545.exe Trojan.Generic.1328988 Deleted