Permissions change: what some people do

First off, this is not me. One of the users local to me has a MacBook (he believes is 2.1GHz with 80G hard disk) and he does not know when not to touch things.
He tells me on the phone, that in his Admin account he used Get Information to bring up the panel for the hard disk and looked at Sharing Permissions. On mine (user account) I see System - Read & Write; Admin - Read & Write; Everyone - Read Only.
He has changed that Read Only to No Access and, unsurprisingly, the computer will not start: he sees the Apple logo and the spinning gear wheel and it keeps on spinning. I am really not sure what to advise, as this seems to require some access, perhaps using the Single User mode and entering commands that way. He has backed up his data (he took that much in from me), so if a total re-install is needed, he can go that way, but at this stage I am not going to suggest this.
Can anyone offer advice that I can pass on, please?

Hi Graham,
Roam links to a good solution.
Another option (GUI) would be to start up from the Instal Disc. Choose the language and wait for the Menu Bar to appear. Then choose "Reset Password" from the "Utilities" Menu.
Select your startup disk, then choose your user from the popup list. You do not want to change the password, instead *choose the option at the bottom to Repair Permissions and ACLs* on that user's Home Folder. Then Restart from normally.
-mj

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