Unable to disable SMB file sharing: Incorrect password error

I'm not sure if this problem was present prior to updating to Lion from the latest 10.6, but I can't seem to disable file sharing using SMB on my MBP. I've only known to have used my login password as the same login when I activated SMB share a while back, and now all I get when using the same password is "Incorrect Password". I've tried implementing most of the suggestions I've found in this forum and on the web and that included resetting the password in System Preferences > Users & Groups (Accounts). I logged in using another admin account and it would not also let me turn off SMB sharing and returning an error "Incorrect Password" whenever I typed in what I believe to be the correct password (which is the user/admin pw used to log into the account currently being used). I have also tried: looking through the System Preferences > Security & Privacy (in hopes that FileVault has a hand in this, and it is currently off), then tried repairing Keychain (newp), and lastly, changed the Master Password to no avail. The one suggested fix I didn't try is creating a new user account and migrating all my files to that account. I'd rather not since that is way too much hassle just to turn off SMB sharing.

If anyone has ideas on how to reset or turn off file sharing using SMB, or knows how to resolve this issue, please post some help as this is driving me batty.

Thanks!

PS. Also another unrealted question: Is AirDrop not supported on a 2008 MBP? For the life of me, I couldn't find AirDrop anywhere on my mac (looked at the sidebar and prefs to enable it and it's not there as an option). My card type is an AirPort Extreme (802.11 a/b/g/n -- with firmware Broadcom BCM43xx 1.0)