We have had to make a change to default user's registry to about 15 images to save recapturing them.  Office 2012 was trying to re-register itself for every user on the deployed images.  This is the task I created to do this

start /wait reg load HKU\temphive c:\users\default\ntuser.dat

start /wait reg add "HKU\temphive\Software\MicroSoft\Office\14.0\Excel\Options" /v NoReReg /t REG_DWORD /d 1 /f

start /wait reg add "HKU\temphive\Software\MicroSoft\Office\14.0\Word\Options" /v NoReReg /t REG_DWORD /d 1 /f

start /wait reg unload HKU\temphive