Save the hard drive. Sometimes you can add it as a second drive and copy the data (or at least some of it) from the old drive to the new one. However, that said, don't install the new drive until after you've gotten a good virus program installed with all updates. Sometimes a virus can cause a system meltdown, and you don't want it on you're new system. Sigh... been there, got the t-shirt free with the new system. Good luck!