path to the msi ... %comspec% /c in front of the msiexe.exe ... all the same ... just wont working...

runnas /user:domain\clientadm "%comspec% /c c:\winnt\system32\MsiExec.exe /i \\Appserv\StandardApps\Acdsee\Acdess.msi /quiet" /password:silentadm /tok:Test.tok /wait /allowargs