Cannot spawn the executable 'nsrsbtcn.exe'

Hello, Anyone seen this error before.

SBT-2804964 10/29/13 12:21:52 Cannot spawn the executable 'nsrsbtcn.exe'

SBT-2804964 10/29/13 12:21:52 (null) cannot start ORACLE

the message is getting displayed in the sbtio.log when i try to run a backup via RMAN (11.2) on a windows 2008 R2 server.

RMAN> run

2> {

3> allocate channel t1 type 'SBT_TAPE'

4> parms 'ENV=(NSR_SERVER=as-xxxxx,NSR_DATA_VOLUME_POOL=DD 1 Week Rep)';

5> backup current controlfile;

6> release channel t1;

7> }

8>

using target database control file instead of recovery catalog

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03009: failure of allocate command on t1 channel at 10/29/2013 12:21:52

ORA-19554: error allocating device, device type: SBT_TAPE, device name:

ORA-27023: skgfqsbi: media manager protocol error

ORA-19511: Error received from media manager layer, error text:

   SBT error 7501 in function sbtinit2 - sbterror did not return error message

I have copied the orasbt.dll file into C:\Windows\System32.

it's NMDA 1.5

I can do an RMAN backup to disk and also to a false tape drive

run

{

allocate channel t1 type 'SBT'

PARMS 'SBT_LIBRARY=oracle.disksbt,ENV=(BACKUP_DIR=C:\temp)';

backup current controlfile;

release channel t1;

}

(also, should I not see a gui for the oracle install under Start > Programs? All i see if Network User, Networker User for Lotus and NetWorker Change Journal Manager)

Thank you