Permissions Mysteriously Changed

I regularly access my second hard drive (internal) but, suddenly today the permissions have changed. I have no idea why. What's worse is that I can't change them back. Under all categories, it is now on "custom". When I try to change them, it goes straight back to "custom". The icon of the second HD has a lock on it now and when I try to open it, I am told that I don't have sufficient access privileges.
I don't understand how this could possible happen. I have made no major changes to anything and nobody has been in my home to hack my computer.
Can anyone help?
Mark.

Glad things are working again!
A further caveat if you did an Archive and Install rather than an Erase and Install - When you clicked "Apply to Enclosed Items" it presumably affected everything on the HD, and as I had mentioned earlier, an Archive and Install, preserving Users, might not fix the ownership and permissions on your Home folder and its contents. Disk Utility's Repair Disk Permissions won't fix a Home folder either. The startup volume was owned by System; your user account should own everything in your Home folder. A further wrinkle, which pushes my limited knowledge of Unix, is that the permissions on the startup volume include a set "sticky bit", and this might also have gotten transmitted everywhere else, leading to potential problems when deleting things.
I would do a Get Info now on your Home folder and on a few of your files and folders within it, and make sure you are listed at the top of the permissions list, with read-write privileges. "System" should not appear there. If there does seem to be a problem with the ownership and permissions of your home folder, [this post by V.K.|http://discussions.apple.com/thread.jspa?messageID=10885473&#10885473] in the thread I had listed earlier describes how to fix it.

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