I played through the first couple of missions and I really enjoy the game, but I think this game may have messed up my computer.
For some reason, after installing and running the game for the first time, my computer could only recognize half of the memory I originally installed. I maxed it out at 4GB a couple of years ago, and I checked recently before installing SC2.
I kept getting messages telling me to close any programs I might have running in the background to improve performance, and I though it was strange seeing that I was not running anything in the background and I am using the minimum graphics card settings when I know my graphics card is well capable of handling this game. When I checked my computer performance, it stated that I am only running with 1.5GBs of memory now. I have no idea what happened to my memory.
So, after my trial period is over, I'll probably stop playing until I figure out whats going on.