I have Snow Leopard 10.6.3 on my 13" Macbook Pro, and I kept getting weird messages about .kext files being unusable. I ran startup verification in Onyx, which told me that my startup volume needed to be repaired. Therefore, I rebooted from the original startup disk, and repaired my disk. When I booted back up, there is still a message that says "System Extension Cannot Be Used." They appear to be mostly print drivers, as well as the NTFS Paragon driver. Anyone know how to repair these files, or make the messages stop coming? There are like 20 of them.