Scheduled LDIScn32.exe not silent

Hi all

When the scheduled LANDesk Scan runs on some machines, a DOS box pops-up on screen (screenshot attached).  I have compared the LocalSch.log of an affected machine with a non-affected machine but there is no difference, both execute the following command:-

C:\Program Files\LANDesk\LDClient\LDIScn32.EXE /NTT=LDSLAN01:5007 /S=LDSLAN01  /I=HTTP://LDSLAN01/ldlogon/ldappl3.ldz/NOUI

Without having to wait for the next scheduled scan to begin, I can replicate it but running this command manually.

How can we make these machines execute a SILENT scheduled scan please?

Thanks
Scott