@echo off
pushd %PROGRAMFILES%
if exist SumatraPDF (
cd SumatraPDF
if exist SumatraPDF.exe ren SumatraPDF.exe SumatraPDF.exe.tmp
)
popd

if .%1.==.-c. goto CCC
cmd /k call setenvironment.bat
goto END
:CCC
cmd /k call setenvironment.bat -c
:END
pushd %SystemRoot%\temp
if exist texmf rd /s/q texmf
popd

pushd %PROGRAMFILES%
if exist SumatraPDF (
cd SumatraPDF
if exist SumatraPDF.exe.tmp ren SumatraPDF.exe.tmp SumatraPDF.exe
)
popd