diff --git a/src/windows-build.bat b/src/windows-build.bat
index 32ff9226..64414452 100644
--- a/src/windows-build.bat
+++ b/src/windows-build.bat
@@ -5,13 +5,13 @@ rmdir /q /s dist
 del /q /f gam-%1-windows.zip
 del /q /f gam-%1-windows-x64.zip
 
-c:\python27-32\scripts\pyinstaller -F --distpath=gam windows-gam.spec
+c:\python27-32\scripts\pyinstaller --clean -F --distpath=gam windows-gam.spec
 xcopy LICENSE gam\
 xcopy whatsnew.txt gam\
 del gam\w9xpopen.exe
-"%ProgramFiles(x86)%\7-Zip\7z.exe" a -tzip gam-%1-windows.zip gam\ -xr!.svn
+"%ProgramFiles%\7-Zip\7z.exe" a -tzip gam-%1-windows.zip gam\ -xr!.svn
 
-c:\python27\scripts\pyinstaller -F --distpath=gam-64 windows-gam.spec
+c:\python27-64\scripts\pyinstaller --clean -F --distpath=gam-64 windows-gam.spec
 xcopy LICENSE gam-64\
 xcopy whatsnew.txt gam-64\
-"%ProgramFiles(x86)%\7-Zip\7z.exe" a -tzip gam-%1-windows-x64.zip gam-64\ -xr!.svn
+"%ProgramFiles%\7-Zip\7z.exe" a -tzip gam-%1-windows-x64.zip gam-64\ -xr!.svn