I had a phone call from a friend today, he could not get an advertisement to run.

He emailed me over the execmgr.log, this is what I could see

Creating mandatory request for advert AA120134, program Installation, package AA120234 execmgr 21/1/2011 1:27:23 PM 1064 (0x0428)
Download content and mapped drive required. AA120134 - Installation not acceptable by client execmgr 21/1/2011 1:27:23 PM 2468 (0x09A4)
RaisePolicyStateStatusMessage - invalid policy received execmgr 21/1/2011 1:27:23 PM 2468 (0x09A4)

 Resolution

You cannot combine download content and requires drive letter
Either set to run from distribution point or use requires drive letter