Depends on what you want to copy - the entire system or just the saved data.
Personally, I would take the opportunity to do a fresh install of Windows on the new disk. Once that is done, I would reconnect the old disk (set it as slave on the same IDE channel) then boot to DOS and rename the windows folder on the old HDD. Old HDD should come up as D:
Reboot to windows on C: and you can then drag and drop copy all your data to the new drive. Once you are happy you have everything, the old drive can be reformatted and used as a data drive or for first line data backup.
i would follow Jeffers22 suggestion. always best to start with a clean install and then copy over any files you want from your old HDD. only drawback is that all software and programs being installed again a can take a bit of time.
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