I've just come in to find our Windows 7 builds are failing on a specific program that is installed during the task sequence. It happens it was Trend Anti Virus which I had been working on the previous day.
Before getting into the log files I had a look at the task sequence and noticed that there was no program listed. Ah ha! Problem solved > click drop down and select program.... No programs are listed ??!! I checked the package and I have two programs in there - a standard install and one with verbose logging enabled...
Tried deleting the step in the TS and recreating it... Still nothing...
Resolution
I hold my hand up here - I had changed the interaction to "Only when a user is logged in"
Changed it back and sure enough it was back to normal.
Not so much a problem but it's worth noting - if it's a Friday morning and you haven't had your coffee yet it may catch you out...
Hope this helps someone :)