I'm having some big problems after just upgrading to Lion. I was rearranging a few things in the launchpad and then the desktop background was flashing between the default background and a blank gray screen. I've rebooted a few times and have of course repeatedly relaunched finder I've verified and repaired the disk using Disk Utility and everything there is ok. After repeated flashing, its now settled on the blank gray screen. Additionally the dock would not appear. After going into system preferences, and making the dock not hidden, the dock now just repeatedly crashes and restarts. On top of all this, in general the computer is just running EXTREMELY slow. It was fine prior to all of the aforementioned issues. I really have no idea what to do here. Any assistance is appreciated. I'm on a 2007 Macbook Pro 2.33 GHz Core 2 Duo. 2GB 667 MHz ram. Help!