CR2 files not opening in PS CS4 (Canon flaming)

[Trevor Cunningham <trevor@xxxxxxxxxxxxxxxx>]

I have a MacBook Pro with a legit version of Adobe Creatoive Suite CS4. 
Just picked up a Canon S100 this summer, but Photoshop will not read the 
.CR2 files. I installed ACR 5.3 according to the instructions provided 
by Adobe...but it still won't work. Is this a dirty Canon trick where 
your machine won't be allowed to view Canon files after having touched a 
.NEF? Seems like a company that would do something evil like that.