That message means that you have to go in edit-preferences-plug ins & scratch disks and change the scratch disk location by setting it on separate partition. For example if youre primary partition is C: where the windows are instaled then set it to for example on D:, or if you dont have any other partitions create it. The best posible solution would be to get another HDD and set it as scratch disk for PS :) Hope this will help you :) Tihomir

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