You should get the NoCD patch and then you won't need to risk damaging your disc. I've got 7 different installs of NR2003 and none of them need the disc. I'd direct you to a download but, depending on your OS (Operating System...XP, Vista, Win7, Win8), there may be additional steps you'll need to take to get it to work. Just Google: NR2003 NoCD and a bunch of results will kick up. Look for a result that mentions your OS.