Software Deployment

I am fairly new to creating and distributing packages through SMS. I am currently working on creating and deploying Project and Visio 2003 to a limited number of users throughout the network. Users request the program and then are added to a new collection and the advertisement is sent to that collection. My problem is that the advertisement seems to be lost somewhere between SMS and the client. I sent the advertisement out to 3 machines (all test machines) and it was recieved quickly by one of the machines and was installed with no problems/errors. The other 2 machines never got the advertisement. I am basically looking for any tips/tricks/ideas on how to troubleshoot where the problem is. I have checked the package/advertisement status in SMS Admin console and no problems exist. I have used advertview and again, no problems exist. I checked the log files at winnt\MS\.....\logs\ and couldnt see any problems (the log files are pretty ugly, so I might need help on WHAT to look for). I also checked out where the jobs are stored after completion (C:\WINNT\MS\SMS\clicomp\apa\Data) to see if they were getting there and failing out. I am not really sure where to go from this point. Any help would be greatly appreciated as I am stuck on this and running out of ideas....