Already answered ur previous thread. Please have a look here ….
Also u can link here for clear concept :
I guess that combination of software used to make the disc, i.e. which SW was used. If it is created from ISO or copy to copy DVD. Generally Nero is the first choice and also the speed is factor, the type of DVD. U may burn the DVD with low speed.
Or if u have the original DVD/CD, then, try using another CD/DVD drive or if possible use an external drive. Also do a firmware upgrade on the Cd/Dvd drive.
Also check for bad sectors in HDD and Check BIOS setup for no virus protection….because it may prevent to access MBR.