fixed the installer in msysgit environment to work with windows XP
as the command 'choice' is not available on Windows XP we have to work around
this issue by usage of 'set /p'
diff --git a/contrib/msysgit-install.cmd b/contrib/msysgit-install.cmd
index 1285839..5f005bf 100644
--- a/contrib/msysgit-install.cmd
+++ b/contrib/msysgit-install.cmd
@@ -22,11 +22,11 @@
if not exist "%GIT_HOME%\bin\git-flow" goto :Install
echo GitFlow is already installed.>&2
-choice /C YN /M "Do you want to replace it"
-if errorlevel 255 goto :Abort
-if errorlevel 2 goto :Abort
-if not errorlevel 1 goto :Abort
+set /p mychoice="Do you want to replace it [y/n]"
+if "%mychoice%"=="y" goto :DeleteOldFiles
+goto :Abort
+:DeleteOldFiles
echo Deleting old files...
for /F %%i in ("%GIT_HOME%\git-flow*" "%GIT_HOME%\gitflow-*") do if exist "%%~fi" del /F /Q "%%~fi"