Intel imac wont start after changing permission

intel imac wont start after i changed my hard drive permission to let me read and write, then i clicked apply to all enclosed files.i turned it off no problem. then it never started up again in os x. the grey screen with apple logo appears,then after a minute it restarts, and will keep doing that if i let it. i can start up in windows xp, but i dont know how to do anything in windows xp that will affect os x. i can use the hard drive in target mode, but i cant figure out how that can help me. i use a macbook to view target disk. ive spent hours looking through help and support. finally i do not have the os install disks. PLEASE HELP!

My apologies for the inept instructions.
Restart normally. Open Terminal in the Utilities folder. Paste the commands in the Terminal application to avoid typos:
sudo su
Press RETURN. Enter your admin password when prompted.  It will not be echoed to the screen. Press RETURN again. Now paste each of the following at the prompt and press RETURN after each.
chown root:admin /Applications
chmod 0775 /Applications
chown root:admin /Library
chmod 1775 /Library
chown root:admin /System
chmod 0775 /System
chown root:admin /Users
chmod 0775 /Users
chmod -R -N /Applications
chown -R :admin /Applications/*
Again, my apologies.

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