I also have this same problem with the update 090109-0, it stops scanning at C:\Documents and Settings\****\Application Data\Adobe\Acrobat\7.0 on my comptuer and C:\Documents and Settings\****\Application Data\Adobe\Acrobat\6.0\ and C:\Documents and Settings\****\Application Data\Adobe\Acrobat\7 .0\ on my mother's computer.
If three comptuers hang up at the same place it appears that the problem is in the update not the comptuers.
The scan worked fine last night before the update to 090109-0