Damage to disc

[simba of the deep]

Hi All
I have been away from SH3 for a couple of months but i notice a lot of scratches on my disc and i seem to have problems running it so a few questions
1. can i copy the SH3 disc and use only on this pc
2, will it affect the protection on it
3, cannot seem to get a copy over here,i will be changing my rig at the end of the year so it will more then likely be vista,so will their be issues ?
regards