Try this one...
Code:
use express
SELECT DISTINCT dbo.computer.name
FROM dbo.application INNER JOIN
dbo.computer ON dbo.application.computer_id = dbo.computer.computer_id INNER JOIN
dbo.computer_group ON dbo.computer.group_id = dbo.computer_group.group_id
where dbo.computer.name not in(
SELECT DISTINCT dbo.computer.name
FROM dbo.application INNER JOIN
dbo.computer ON dbo.application.computer_id = dbo.computer.computer_id INNER JOIN
dbo.computer_group ON dbo.computer.group_id = dbo.computer_group.group_id
WHERE (dbo.application.description like '%Altiris Agent%')
)
There no IP address in that list, but maybe someone can chime in on adding that column...