No-cd patches are simply (illegal) cracks and we do not permit discussion of them on this forum. You might try cleaning and/or having the disc polished to see if that helps.
If though your original disc is damaged beyond repair, contact the distributor with evidence of purchase and seek a replacement disc. Most will do so for a fairly modest fee.
Once you have repaired or replaced your disc, you might then make a back-up copy (as the time to do so is [B]before[/B] the disc is damaged not after).