Access rights to perform install task

I’m trying to set up an ADMN user that’s able to run current install tasks but isn’t able to modify the existing ones or create any new ones. I’ve had a go and thought I had it but when the new user creates the task it completes straight away and the following is recorded in the remote install log…

09/30/10 16:39:03: rinstInstall begin
09/30/10 16:39:03: Init 50 60 C:\Windows\TEMP\asw18C8.tmp C:\Program Files\Alwil Software\Management Tools\InstPkgs NULL C:\Windows\TEMP\asw18C7.tmp 0
09/30/10 16:39:03: Store
09/30/10 16:39:03: Domains: *,
09/30/10 16:39:03: TerminateAll
09/30/10 16:39:04: rinstInstall end 87

Can anyone shed any light on what I may have done wrong or give me a work through guide on how to set up a new user