i have been using camera raw for 1 yr. great no problems, my computer crashed and had it reworked at my repair guys. all adobe was removed in the process. i reloaded my same discs from last year, cs4 will not read my canon 5dmark 2 compact flash files. it is fine all other ways. i shoot in raw on the camera. 2 weeks ago all was good. i have a wedding that needs to be processed and i cant read the any of the past year's raw files.
Did you ever update camera raw before the computer problems?
If you did, then you probably have to update camera raw again.
You could just use the update function in bridge and see if there are any
updates for cs4 you need.
The latest camera raw plugin for cs4 is 5.7