diff --git a/qemu.nsi b/qemu.nsi
index 0dc1f52..cc5fafd 100644
--- a/qemu.nsi
+++ b/qemu.nsi
@@ -60,7 +60,11 @@
 
 ; Registry key to check for directory (so if you install again, it will
 ; overwrite the old one automatically)
-InstallDirRegKey HKLM "Software\qemu" "Install_Dir"
+!ifdef W64
+InstallDirRegKey HKLM "Software\qemu64" "Install_Dir"
+!else
+InstallDirRegKey HKLM "Software\qemu32" "Install_Dir"
+!endif
 
 ; Request administrator privileges for Windows Vista.
 RequestExecutionLevel admin