"Other" login identity. How do I get rid of it?

I am using an iMac desktop running Lion 10.7.5. I had a problem last night. When I tried to login, I typed in my password. It seemed like it was going through its normal routine but it took me back to the gray screen where you type in your password. I tried typing in my password again and again, but it never worked. It always went back to the gray screen where you type in your password. I tried restarting, it didn't work. I tried running the disk utility, it didn't work. I went online with my Macbook Pro and found the following article:

https://discussions.apple.com/docs/DOC-3622

I tried resetting the PRAM, it didn't work. I evenually tried step 6 in this article - resetting the password, it didn't work. I tried

Reset Home Directory Permissions and ACLs, (part of step 6). That didn't work, but when I restarted the machine after trying to "Reset Home Directory Permissions and ACLs", I now had two options to login, my regular identity and a new one called "Other". Eventually, I tried reinstalling Lion. That DID work, but now when I start the machine I still have the two indentities at the login screen. How can I get rid of the identity labled "Other"? I tried going to "Users and Accounts" to delete it in the "normal" way, but that didn't work, the "Other" account is not listed in the Users and Accounts preferences window. The "Other" identity IS still there when I go to login. How do I get rid of this? Thanks!