Well, like Wolf said, can you post your specs? But, I will use my mystical powers to determine your problem right now.
You will most likely have to do a transfer of data on your Hard drives. If you are getting a new computer, you need the Hard Drive within your current system to make that transfer.
--->***DO NOT THROW IT AWAY***<---until after a couple of weeks, just to be on the safe side. All data should transfer nicely and quickly, but on occasion, you COULD experience problems, not likely.
Let us know your specs, and what you're going to do.