My 17 inch Acer has a failing DVDRW. It does the same. For now we pull the DVDRW out while we ponder if we want to replace it or get a new laptop.

BEWARE THAT LAPTOPS are proving to be 4 year devices. Many can't accept this but the proof is simple. Look at the failures.

About registry software. The consensus of the moderators is these are junk. Great way to corrupt an OS. If we lose the OS due to this, we reload the machine.
Bob