Have you run the Samsung drive diagnostics? Download it from this link. Drive Testing Tools
If you don't have a burning program that will burn .ISO files get burncdcc from my signature below ..a small FAST no frills iso burning program..
Burbcdcc
NOTE...do not put a blank cd in until burncdcc opens the tray for you
1. Start BurnCDCC
2. Browse to the ISO file you want to burn on cd/dvd ....
3. Select the ISO file
4. click on Start
Have you run the error checking on the drive?
Go to Start/ My Computer/ right click on C drive/ choose properties/ choose tools tab/ choose error checking