diff --git a/mk/windoze/Installer/MegaGlestInstaller.nsi b/mk/windoze/Installer/MegaGlestInstaller.nsi
index c4d02de82..1cf9cba7c 100644
--- a/mk/windoze/Installer/MegaGlestInstaller.nsi
+++ b/mk/windoze/Installer/MegaGlestInstaller.nsi
@@ -71,14 +71,16 @@ Function MUIGUIInit
    ReadRegStr $R0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APNAME}_${APVER}" "UninstallString"
    StrCmp $R0 "" doneInit
 
-MessageBox MB_OKCANCEL|MB_ICONEXCLAMATION \
-  "${APNAME} v${APVER} is already installed. $\n$\nClick `OK` to remove the \
-  previous installation or `Cancel` to install to a different location." \
-  IDOK uninstInit
+MessageBox MB_YESNO|MB_ICONEXCLAMATION \
+  "${APNAME} v${APVER} is already installed. $\n$\nClick `Yes` to remove the \
+  previous installation or `No` to over-write or install to a different location." \
+  IDYES uninstInit
 
-  # change install folder to a version specific name to aovid over-writing
+  # change install folder to a version specific name to avoid over-writing
   # old one
   StrCpy $INSTDIR "$PROGRAMFILES\${APNAME}_${APVER}"
+  ClearErrors
+  
   goto doneInit
 
 ;Run the uninstaller