Another repeating issue.

Once in awhile you'll encounter an Office CD that seems fine but it won't install from the CD. I've copied to to some USB stick which is now very easy and cheap.

The issue may still be open for your machine but so far, this one is solved for the majority of folk. If there is any issue with the old CD or the drive, the issues you have will occur. However you find many owners reluctant to outright in denial that anything could be wrong with the machine or media. Usually you have to give them time. They usually end up on another PC.