Cannot find mach_kernel file
I am using Mac OS X 10.10 (Yosemite). I am trying to install VMware Fusion 3 and I am getting an error that says "The kernel could not be located. Please restore the /mach_kernel file from your Mac OS X install disc." I don't have an install disc, as it never came with my Mac Air. I open up Terminal and I run the command "ls -la /" I do not see a mach_kernel file. How do I get this file?
MacBook Air, OS X Yosemite (10.10)