Software Rollout and software for new installed computers

One more problem with the altiris software delivery. As I told before, I roll out the Adobe Reader 9 and it went well. The job for the rollout ist assigned to the collection "All computers", excluded is the collection "Computer with Adobe Reader 9 installed".
The job is active and is to be active in the future to catch all computers (computers which are most time offline and new imaged computer) to install the Reader 9. So far so good.

Now I updated 1 of our 5 images and installed among other things the Reader 9. When I install a computer with this image and the computer get's the altiris agent, the job for the Adobe Reader 9 install runs! I think, this is because the Reader 9-job runs before the inventory-job of the computer has run or the collections on the server are updated with the information, that this client has already the Reader 9 installed and so the job must not run!

Do you know of this problem.?How are you handling this?

Regards
Linne