Adobe has their support on such. You may have to try it on another machine to see if you like the product. Remember, it's not to do any actual work, but to let you look around, nothing more.
Another method is to wipe the hard disk and start over.
Okay, this wonderful piece of software says I have 30 days to use it in. However, second day I try to open it, it says Time Expired. I tried to delete it and re-install it, but quite obviously there's some file telling it that my time is up. If anyone knows the filename or a way to find it, I'd be grateful.