Photoshop Elements :: Create Catalog In New PC / When Old PC Crashed Unexpectedly

My laptop recently died before I was unable to do a backup of the PSE 9 catalog.  I thought I was covered, however, since I do regular backups of my total system.  In reviewing the backup data though, I discovered that I had copies of all of my pictures -- but the backup tool that I was using was NOT copying the PSE catalog file.  Bottom line, I'm now missing probably 15+ years of catalog information......
 
Someone has told me that they believe they can pull some information off the damaged disk of the old PC.  If this is possible, what file(s) should I ask them to try and recover -- and where would it likely be located?
 
Windows 7 OSPSE 9Catalog was not backup prior to system crash. I do not recall file structure of where photos were stored -- but I do have back up copies of all pictures (now stored on my new laptop)