First of all I asked the professionals to comment about it. If not professionals then atleast the ones who know about corporate notebooks.
@pardesi90 has rightly said that this is a corporate model not for watching movies or playing games.
Secondly the laptops bought from Megaplus are expensive than the ones available in market. Megaplus is the only authorized dealer of DELL in Pakistan and it has its offices in Karachi, Lahore, Islamabad and Peshawar. They replace the faulty hardware without asking any question. One the other hand, the other laptops are having one year warrantee which can be claimed in Dubai or any other foreign country.
I bought this laptop in June 2007 for 90K Rs from Megaplus Islamabad. I had to pay the tax because consumer laptops are exempted from tax but not corporate ones.
Anyways thanks everyone for replying. I will take that laptop to the market tomorrow. I will sell it if it gives me good money, otherwise I will keep it as it is still in warrantee for 416 days.