[s600]

Попробуй так. У меня все работает таким способом:
@echo off
CD /d "%~dp0"
SetLocal EnableExtensions EnableDelayedExpansion
FOR %%i IN (C D E F G H I J K L M N O P Q R S T U V W X Y Z) DO DIR %%i:>NUL 2>&1 && SET zz=!zz!%%i
FOR %%i IN (%zz%) DO IF EXIST %%i:\2k10\WinNTSetup\WPI\Drivers\SDI.exe SET InstallMedia=%%i:
CD /d "%InstallMedia%\2k10\WinNTSetup\WPI\Drivers"
SDI.exe "-drp_dir:drivers" "-index_dir:indexes\SDI" "-output_dir:indexes\SDI\txt" "-log_dir:%WINDIR%\Logs\SDILog" "-data_dir:tools\SDI" "-finish_cmd:" "-finishrb_cmd:" -filters:1154 "-lang:Russian" "-theme:Classic_2" -license -nosnapshot -autoinstall -autoclose -preservecfg
exit

Или вот так, без автоматизации:
@echo off
CD /d "%~dp0"
SetLocal EnableExtensions EnableDelayedExpansion
FOR %%i IN (C D E F G H I J K L M N O P Q R S T U V W X Y Z) DO DIR %%i:>NUL 2>&1 && SET zz=!zz!%%i
FOR %%i IN (%zz%) DO IF EXIST %%i:\2k10\WinNTSetup\WPI\Drivers\SDI.exe SET InstallMedia=%%i:
CD /d "%InstallMedia%\2k10\WinNTSetup\WPI\Drivers"
SDI.exe
exit