Hello, Today, I just received copies of LR 2.0 and CS4, which I ordered from amazon.com. Because a previous version of LR was installed/removed it's serial # is still sitting in some file on my HD. Which file is this? Would like to remove it so that I can add my new serial #. And, regarding CS4, it won't run. Giving me a "...won't run on this architechture" error message. And no I didn't previously have a version of CS4 Master Edition (Googled that this happened to some one who did). Again, there must be some "system file" I can remove from my HD. Please help! Unfortunately I didn't buy Time Capsule and thus did not have Time Machine enabled. So I can't just go back a few weeks to before I was playing with Adobe apps. Hate to have to wait till I get home and have to "reformat" my HD.