MAC wont re-boot after Panic

I keep getting a Panic despite powering down and re-starting. Looks like the same one each time but not sure of the details. I havent captured the details of the 4 args but the rest is:
Panic(cpu0caller 0x55bfa5): Unable to find driver to this platform :\"ACPI|".\n"@/SourceCache/xnu/xnu-1504.9.17/iokit/kernel/IOPlatfromExpert.cpp: 1389
4 potential Args
BSD: unknown
MAC O/S: unknown
Kernel 10.5.0 xnu 1504.9.17al Release_I386
This all happened after I followed following advise to make Outlook 2011 the default mail app.
"You might try removing these files in your User's Library/Preferences and
see if this will allow you to reset.
com.apple.internetconfigpriv.plist
com.apple.LaunchServices.plist"
I then changed the permissions on all users to Read Write and got an error message relating to a .kext. The error message would not close. I did a search on this error and a post suggested repairing permissions on the MAC disk as a first step. It said to re-boot on completion. I did this and it completed successfully although the error message was still there.
I re-booted and got the above panic loop.
I do not have anything added to the iMac. It does have a LAN connection to my Time Machine.
Help!
Thanks
Mark

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