Titanium Install for Dummies

[Pixio]

I played P99 a few years back and would like to play again. I have the 5 discs Titanium on my computer. Disc 2 says something about "the disc image file is corrupted". I am an old man and don't know anything about fixing computer stuff. When I played before someone connected to my computer remotely and set it up for me. Ideally Id like to recover my old account.