Handy script for cleaning up old temporary files on windows. ReportQueue (from error reporting) gets especially large...

cleanup_temp_files.bat

@echo off

IF EXIST c:\windows\temp\ (
  forfiles /p "C:\Windows\Temp" /s /m *.* /D -7 /C "cmd /c del /Q @path"
)

IF EXIST "C:\Users\" (
  for /D %%x in ("C:\Users\*") do (               
    forfiles /p "%%x\AppData\Local\Temp" /s /m *.* /D -7 /C "cmd /c del /Q @path"
    forfiles /p "%%x\AppData\Local\Microsoft\Windows\Temporary Internet Files" /s /m *.* /D -7 /C "cmd /c del /Q @path"
    forfiles /p "%%x\AppData\Local\Microsoft\Windows\WER\ReportQueue" /s /m *.* /C "cmd /c del /Q @path"
  )
)                      

http://stackoverflow.com/questions/50902/how-do-i-delete-old-files-from-a-directory-while-keeping-the-most-recent-ones-on
http://stackoverflow.com/questions/51054/batch-file-to-delete-files-older-than-n-days
http://ss64.com/nt/forfiles.html