Hey JellyGigglerMan and welcome to TSF!
Is this being installed from a disc?
If so, check that the disc isn't scratched. If the disc is scratched you can first try copying the contents of the disc to your desktop or wherever; then try installing. If the copying of the files to your desktop fails you know there is a problem with the disc.
In such an event you could use this
to get the damaged content from the disc.
Failing the above, or as an alternative you could lightly polish the damaged area with toothpaste. Be careful as over polishing can ruin the disc, don't apply too much pressure and do so lightly.
If you don't want to polish yourself ask your local game store or DVD rental place to polish the disc for you, if it is damaged that is.