.dll problems

Recently, I tried to install the game Mass Effect 2 on my pc. After a while of screwing around trying to get settings and optical drives to work, I began receiving error messages relating to missing .dll files. I began installing the new needed file, trying again, finding the next file, installing, etc. Now I am receiving a message pertaining to the contents of one of my .dll files. A screencapture of the new message is attached. Please help, and also, if possible, direct me to a site or technique that will update all of my graphics drivers. I have found the programs online that do so, but demand you register and pay, and I am sure I would be capable of fixing these problems by myself. Thanks