For what to do with the DBX and WAB files, see:
Backing Up, Recovering and Restoring Outlook Express versions 5 & 6
Files and Settings
http://www.oehelp.com/backup.aspx
http://www.insideoe.com/backup/index.htm

If you have trouble reading or finding the old DBX, one of these might
help
DBXtract - http://www.oehelp.com/DBXtract/Default.aspx
DBXpress - http://www.oehelp.com/DBXpress/Default.aspx
DBXtend - http://www.oehelp.com/DBXtend/Default.aspx

For more on the WAB file, see:
The Windows Address Book (WAB)
http://www.insideoe.com/files/wab.htm

For further help

Use the following newsgroup for questions or problems with OE6
news://msnews.microsoft.com/microsoft.public.windows.inetexplorer.ie6_outlookexpress

You can also get to the Outlook Express newsgroups via this web site:
http://www.microsoft.com/communities/newsgroups/default.mspx
There select Internet Explorer, then Outlook Express.

You will find out information about issues affecting Outlook Express 5/6
at:
http://www.oehelp.com/
http://www.geocities.com/SiliconValley/Bay/6386/IE_ng_notes.htm
http://home.attbi.com/~jimpickering/
http://www.insideoe.com/
http://www.kellys-korner-xp.com/xp_oe.htm

SInce you've already created a new Outlook Express on the system, do not try
to jjust copy the old DBX files and Address Book to the new setup. It won't
work that way.

If you do recover them from the drive, use File | Import instead.
Create a temp folder such as C:\OldMail
Copy the DBX files and WAB file to it from the old drive.
File | Import | Messages | Microsoft Outlook Express 6 | Import from an OE6
store directory
Press OK then press Browse and navigate to the C:\OldMail folder, select it
then press OK and finish up the Import.

For the Address Book,  File | Import | Address Book and select the old WAB
file and import it.

Now, if Outlook was used as was set as the default for Contacts  and email,
you will need to hunt up the .PST file used by Outlook. You will also need
to reinstall Outlook on the new setup, import the old messages File | Import
and Export | Import from another program or file | Select Personal Folder
File  then work thru the rest of the import wizard for it.

Once there, you can export only the Contacts as a Comma Separated Values
text file that Outlook Express's Address Book can import.