Get data off old hard drive

Hi,
Old system crashed. Needs new everything and is 3ys old so I’m getting a new computer. The hard drive is ok, so I’d like to get the data off the old hard drive to the new computer. I’m going to convert it to an external HD. The “my documents” are no problem. How do I get Outlook express files and others that are not stored in my docs to move to the new hard drive in the new system? The old system was running Win XP. The new will be running Vista.

Thanks for any help.