Err...really? 1
MB of ram? How do you survive?
Do you have applications automatically starting when you log in? That can slow the login. If you believe that being the admin has you loging in faster, you can make your normal login an admin user as well - log in as the admin user, open up the Accounts preference pane (in System Preferences), choose your normal login, choose Edit User, and at the bottom of the popup dialog there's a checkbox that says "Allow user to administer this computer." If you check, it makes that user an admin.
I don't really think that'll make your login any faster, though. Also, you can delete users and make new users from the Accounts preference pane.
fsck (lowercase, BTW) is a command-line program that will fix problems on your drive. To use it, hold down command (apple) s the next time you reboot or startup the computer. It will dump you into the console - just text. There's a prompt that says to type
fsck -y - do that, and keep doing it until fsck reports no errors (it'll say ***SYSTEM MODIFIED**** or something like that when it corrects an error). You may have to run it several times before it reports no errors. After that, type
/sbin/mount -uw /, then type
exit to continue booting up normally.
fsck stands for, I believe,
file
system
chec
k - I could be wrong on that one.