Go into taskmanager and tell us the top-5-processes after sorting on CPU usage. Also tell about your graphic card.
I have PC with configuration of Pantium D processor and 512 MB RAM.It was working fine until i replace 512 RAM with 1 GB RAM. Now mkv video or any high quality video is not playing continuously and CPU used is more than 90%. Even if i switched back to 512 MB RAM , Problem is there. Could anybody suggest anything please?