CAD tip # 10206:

How to batch-delete all OldVersion folders?

  
@ECHO off  
ECHO Remove OldVersions folders:  
for /d /r ".\" %%a in (OldVersions\) do if exist "%%a" (  
 echo %%a  
 rmdir /s /q "%%a"  
 )  
pause  

Copy this contents to a .bat file. Then run this BAT file in the requested folder - e.g. from a DOS window or by doubleclick. This batch removes all "OldVersions" folders in the current location and in all subfolders under it, including the folder contents.