Dvd/cd writer malfunction

internal dvd/cd writer [acer aspire]not seeing blank cd discs.Only problem is cd discs.Have tried varous discs/burning software no joy.System restore fixed for a few days,but problem returned.Also on reboot i get the message"the boot priority has been changed".I dont know if that may be the cause.I am just getting into computers and would appreciate any suggestions.

Disable imapi service and deamon tools and virtual drive softwares!