Are you sure the second disc is corrupted?
The reason i ask this is that certain releases of MSTS had a copy protection on the second disc which makes it seem broken. The drive seems to be constantly jumping from track to track and really slow. This is normal on newer systems, although a real nuisance.
There are two ways around this. 1) Install MSTS on an XP computer and then copy the files you want. OR........
2) Be patient. While disc 1 will copy straight to your hard drive, disc 2 will take about an hour and a half (at least it does on my win10 computer) - But, it WILL eventually copy completely.
Once you have both CD's copied to your hard drive, you can then install MSTS from there if you so wish.
Hope this answers your question,
Izzy
I believe that, in creating man, God overestimated his abilities - Oscar Wilde