For Windows NT, you could use the AT command. AT is the automatic task for windows. In a DOS windows type AT. (But verify in the NT Services to see if the service SCHEDULE is sarted. If not start it.

You could write a batch file to delete the archive file and then in the AT command, start the batch file every day.

Ex: batch file :

@echo off
del /q e:\oracle\oradata\(BD)\archive\*.*


ex : AT

AT 7:00 /every:su,m,t,w,th,f,s c:\delete.bat


that all for Windows NT.