Carol:
If you haven't solve this issue already. Try rebooting the workstation. Some "weird" things disappear after rebooting. If it is Windows 7 or Vista, remove the User Account Control Settings. It makes some drive mapping not to show when installing. The other reason may be that the user actually doesnt have rights to delete or move files in the APWIN and/or Receivables folder. You may be able to create or modify but not delete.

Hope this helps.