I was thinking about using the software mentioned above, but instead of downloading an open sourced piece of software and learning howto run/use it... I was thinking about getting some software that can recover deleted files on old hard drives and try to find either *.dat files (in hopes of wallets) and files named "utc".
I'll make it simple for you. For the above program, you download and install Node.js, then you run inside the command prompt:
npm install findwallet -g
After that you run it like this:
findwallet -i -o output_list_of_files.txt
This will make a file called output_list_of_files.txt in your home folder with the paths to all the wallet.dat files it found.
It will not find deleted wallet files, so if you have any of those, use some recovery software to restore them.