this is os detect batchfile. this file uses only ver command and this can't detect server or client. This is because of speed. systeminfo.exe can detect server or client but that is very slow. "ver" comannd returns result very fast.

osdetect.bat

@ECHO off 

VER | find "95" > nul 
IF not errorlevel 1 GOTO Win_95

VER | find "98" > nul 
IF not errorlevel 1 GOTO Win_98

VER | find "NT" > nul 
IF not errorlevel 1 GOTO Win_NT

VER | find "2000" > nul 
IF not errorlevel 1 GOTO Win_2000

VER | find "XP" > nul 
IF not errorlevel 1 GOTO Win_XP

VER | find "Version 5.2." > nul
IF not errorlevel 1 GOTO Win_XP64or2003

VER | find "Version 6.0." > nul
IF not errorlevel 1 GOTO Win_Vistaor2008

VER | find "Version 6.1." > nul
IF not errorlevel 1 GOTO Win_7or2008R2

VER | find "Version 6.2." > nul
IF not errorlevel 1 GOTO Win_8or2012

GOTO unknown_os 

:win_95
echo "This is Windows 95"
goto end

:win_98
echo "This is Windows 98"
goto end

:win_NT 
echo "This is Windows NT"
goto end 

:win_2000
echo "This is Windows 2000"
goto end

:win_XP
echo "This is Windows XP"
goto end

:Win_XP64or2003
echo "This is Windows XP 64bit or Windows Server 2003"
goto end

:win_Vistaor2008
echo "This is Windows Vista or Windows Server 2008"
goto end

:win_7or2008R2
echo "This is Windows 7 or Windows Server 2008 R2"
goto end

:win_8or2012
echo "This is Windows 8 or Windows Server 2012"
goto end


:unknown_os 
:end