Login Problems

Ok, so this time Mac has completely failed me. This is the first time I've ever had a problem I haven't been able to troubleshoot, and the only 2 options I can see are going to be a big pain in the bottom.

So today when I start up my old iMac Flatpanel, I go to login, and it works fine, except when I get in, I instantly get kicked back into the login screen. So I think nothing of it, and try logging in again, and it does the same thing. So I try again and again, and keeps doing the same thing. So I try logging into my other account, and that works fine. So I try all the things I can think of, removing Admin privilages from the problem account, I verify and repair the premissions, I delete all the startup items in all the accounts, etc. But it keeps doing the same thing.

So I try reinstalling OSX keeping the old system, and it still does the same thing with that account.

I can only think of two things that I could do now:

1. Wipe the whole system, and start from scratch, but the problem is all my code, programs, EVERYTHING is on this computer and backing it all up will take a long time
2. Make a new account, transfer all my files from teh problem account over to the new one, and delete the old one, but this one will also take a LOT of time and work.

If anyone has a fix for it, (could it be a unix script somewhere, or a virus?) that would save me a ton of time, I would love to hear it, and I'll try it. Please I need help bad.

EDIT: It was late last night and I didn't give very good details. I'm running 10.2, tcsh, on a 800 Mghz machine.

Also I tried logging in from terminal and it let me but it also gave me this error message.:


I don't know if that's any help, but its there.

EDIT 2: Well I'm not having login troubles anymore, but thats because the HD took a dump. I used the Apple Disk Utility on the install disk and it tells me I have a corrupt B-Tree, so I think i'm out of luck, cuz I don't have DiskWarrior or the like

Actuall Error