Since my mom couldn't connect to the wireless network from her room (week signal) and since my router (D-Link) is 3 years old now, I decided to buy a new one. (all of my friends told me to go for a Linksys).
My new router is Linksys WAG160N. [Alghanim-Avenues, 42.5 KD]
Installation was ok althu there was something wrong with the Installation CD. It kept saying that the ethernet cable is not connected althu it was connected!
The range is wider now. I tried to connect from every room in the house and it was fine.
Update: I couldn't wait till Saturday morning to go with my uncle to Hawally to buy some stuff, he just sent me an SMS telling me he found it there for 32 KD only lol! ... so don't go to Al-Ghanim :p