I was having some issues with one of the computers on the domain. It refused to execute the installers during boot and threw event IDs 103 and 101. I found the solution, and am quoting it below for future reference.
The solution is to set “Startup policy processing wait time” in group policy. It’s located under Computer Configuration | Policies | Admin Templates | System | Group Policy.
Although it states the default is 30 seconds for Vista it appears Windows 7 doesn’t wait at all. The computers now pause for a few seconds at “Applying computer settings” and then correctly process group policy.