Dock, Expose, Hot Corners etc. don't work anymore! Solutions?

Two days ago I decided to restart my Macbook. When the screen popped up it gave me the option of "Reopen windows when logging back in". I never noticed this before switching from Snow Leopard to Lion but maybe it's always been there. Anyways, as you know it is checked by default so I unchecked it just out of curiosity and restarted my system.
When the system came back on, my desktop background had vanished, hot corners will not work, dock does not show up, and when I try to change any of these preferences they do not take. (i.e.-changing orientation of the dock from bottom to left, it simply won't let me select left) I can only open applications from spotlight, and when I mouse over an item now it turns the font white, which never happened before since I did not have it set like that. In addition, google chrome and safari both crash quite frequently since these mess-ups, and so I have resorted to doing all of my work from Firefox.
I've read in these forums as well as other place on the web about this problem happening, but I have tried all of the remedies to no avail. In the past, the problem for users was a lot of the time caused by the use of a wireless mouse. However, I have never used a wireless mouse so this can't be the problem. I also went in to disk utilities and ran a repair, thinking maybe something might click but nothing did. I have restarted/shut down many times just to see if the problem has fixed itself, which it hasn't yet. I've gone into Activity Monitor and relaunched Finder several times, and also noticed that Report Crash is working super hard on the system for some reason. (Maybe because of many of my programs freezing and crashing?) I also deleted many recent downloads, since I had one or two unfinished downloads and this had been the problem for one user inparticular...I did a "Secure Empty Trash" from the finder menu for these items. I also ran CleanMyMac and uninstalled a couple of applications that I don't use just for good measure...still NOTHING.
I'm in no way an expert with computers, I just own a macbook and it's having problems. If you guys could lend your expertise as a last ditch effort that'd be great. I'd prefer not to take it to GeekSquad, Apple Store, or a repair shop because I'm a college student and I'm literally broke at the moment, so any remedies or ideas would take weight off of my chest.
Thanks in advance-Jameson

Also, this black bar shows up towards the bottom of the screen on the left side when it's on the apple loading screen. Not sure what it is...and yes I have also run system updates.

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