Outlook pst file

Hi All,
I had a pc crash but managed to salvage my hdd. I am using my sons pc with vista and I am trying to get my emails and addresses from my old hdd but cannot see the pst file. It only shows 4 files in the folder
outcmd.dat 7kb
outlook.nk2 218kb
outlook.srs 3kb
outlook.xml 5kb
I desperately need to find these old emails.
I have searched the old hdd for pst files none showed up.
Please help
Cheers
Rob