I have upgraded the firmware to the latest 109 for the medium changer. I have restarted the server, and then scan for hardware changes and i noticed that the TAPE DRIVERS- sony sdx 700v wasnt there as i was supposed to, but the SONY lib-81 was there in device manager. I scan again for hardware changes right-clicking on the SCSI card this time and suddenly appearded. Then i run device config in ArcServe and i was running again...!!
Sort it!
Thank you for your help anyway....