You need to decide how "deleted" you want the information to be. Files that are stored somewhere other than the default user file areas, like My Documents and Appdata, will probably not be affected by deleting the user and would need to be manually removed. My understanding is that files in the default user areas are not actually purged, the directory pointers just disappear when the user is removed. A good undelete program would recover them. If it is sensitive information that you don't want accidentally recovered, it would be a good idea to wipe the files while they are still accessible, before the user is deleted.