playing a video is not smooth or pc slows down when copying from the dvd drive. But the dvd drive was working normally.
It may be because of slight modification of settings. To solve this
* go to device manager.
* Under IDE ATA/ATAPI contrllers, check under the advanced settings tab of properties window for all the sub optioins.
* Set transfer mode as DMA for all of them.
* Now restart and check.
* If this doesn't work, just uninstall the dvd driver and select add hardware to reinstall the driver again, this may solve.
* If both of this fails, open your cabinet and plug the dvd drives bus in another socket.