My son outlook express cannot locate the PST files. Tried searching the hard drive
Hidden folder option. Tried to using scanpst. But that too is missing olmapI32.Dll
Should I re- install outlook, or would that erased his saved emails folder.
Running window xp

Try following Microsoft's method for finding those files: How to back up and to restore Outlook Express data (http://support.microsoft.com/kb/270670)

My son found it. He is a computer specialist. He told me he always make copies
Of these things. Thanks anyway.

He's a smart man. :-)