Mac Pro with 10.5.8 not booting

Hi everyone My Mac Pro with 10.5.8 is not booting suddenly, it stays on gray screen with the spinning watch. Actually i was trying to edit the hosts file to patch one application in that process i deleted three file from \private\etc\ folder the files are hostconfig, hosts, hosts.equiv, after this my mac pro is not booting. I am still runing MAC OSX 10.7 lion from the other partition without any problem. But i want osx 10.5.8 to be fixed as i have lots of applications installed in it. Is there any way that i can REPALCE THESE FILES BACK ( BEFORE DELETING THOSE FILES I HAD TAKEN A COPY ASUMMING SOME PROBLEM) OR Can i reinstall same OSX 10.5.8 in it preserving all the settings as it is. I tried Safe Mode, Single user mode for no luck. i tried to get the errors during bootup by pressing Command-V the error shows are 1. bootup lookup server failed, 2. mdsync launch failed (ipc/send) invaild destination port, etc, etc, etc, etc
Can Anyone Hep Me Please
Addins

Restart into Mac OS X 10.7, open the root level of the Mac OS X 10.5 partition, choose Go to Folder from the Finder's Go menu, provide private/etc/ as the path, and drag the backup copies of those files into that folder. If needed, the default permissions for them are system with read and write access, wheel with read only access, and everyone with read only access.
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