Hi
By default Outlook Express keeps your mail store in the following location:
C:\Documents and Settings\Debbie\Local Settings\Application Data\Identities\{0E7F9D26-E476-41C4-8842-9A09BE1E5D5F}\Microsoft\Outlook Express
I am assuming that you backed up onto CD-ROM and when you click the icon it will create a new install.
What you have to do is find the above path on your cd rom ie. D:\\......... and check the folder is there.
Then open outlook express and choose to import from the file menu. Then choose Messages, from Outlook Express 6, then choose from OE6 Store (radion button below).then choose Browse and locate the path above on your CD-ROM. This will import all your messages.
Let me know how you get on.
Debbie