In explorer click once on your c drive to highlight it. Then CTRL + F Key. This will bring up a search box. Type in *.wab and search making a note of the full path to the correct Windows Address Book.
Repeat using *.dbx to locate your old message folders and make a note of the path again.
If they are there (?) you can import them into Outlook Express by going to the FILE > IMPORT menu and selecting them. If you get stuck at this stage look in the help files of OE for a step by step guide.