JazakAllah khair brother Abdel,
I already had the matroska codec installed. I tried several reinstall but of no avail. I have had a high end motherboard but i v never managed to get it stable (M2N32 SLI deluxe+wifi)
I wasnt planning to ugrade the system because I m going on a holiday in a few weeks. :D But I v decided to upgrade anyway because the whole system is getting slower by the day and I need it for my projects :(