Код:

 ::получает в переменную %now% время в формате yyyy.MM.dd_HH:mm
 set tow=%TIME:~0,-3%
 set now=%now::=.%
 set now=%now: =0%
 set now=%DATE:~-4%.%DATE:~3,2%.%DATE:~0,2%_%now%

Код:

::Очистка системы
SetLocal EnableExtensions

For /F "Tokens=2*" %%I In ('Reg Query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList" /V ProfilesDirectory') Do Set Profiles=%%J
Call Set Profiles=%Profiles%

For /F "Delims=" %%I In ('Dir /B /AD-S-H "%Profiles%" ^| FindStr /V /B /I /C:"All Users"') Do (
  RD /S /Q "%Profiles%\%%I\Local Settings\Temp"
  MD       "%Profiles%\%%I\Local Settings\Temp"

  RD /S /Q "%Profiles%\%%I\Local Settings\Temporary Internet Files"
  MD       "%Profiles%\%%I\Local Settings\Temporary Internet Files"

  RD /S /Q "%Profiles%\%%I\Local Settings\\Application Data\Mozilla\Firefox\Profiles"
  MD       "%Profiles%\%%I\Local Settings\\Application Data\Mozilla\Firefox\Profiles"

  RD /S /Q "%Profiles%\%%I\Application Data\Sun\Java\Deployment\cache"
  MD       "%Profiles%\%%I\Application Data\Sun\Java\Deployment\cache"

  RD /S /Q "%Profiles%\%%I\AppData\Local\Temp"
  MD "%Profiles%\%%I\AppData\Local\Microsoft\Windows\Temporary Internet Files"
)

  RD /S /Q %windir%\Temp
  MD /S /Q %windir%\Temp

Код:

::Свободное место(выводися в байтах, поэтому потребуется разделить на 1073741824)
setlocal enableextensions enabledelayedexpansion

for /f "usebackq tokens=2 delims==" %%i in (`wmic.exe LogicalDisk where "Name='c:'" get FreeSpace /value`) do set sFreeSize=%%i

if defined sFreeSize echo [%sFreeSize%]

endlocal
exit /b 0