My friend there could be alot of reasons for such an issue:
**do these steps:
1- check through laptop of one of your friends from same wireless network..

***if problem is the same, then:
--check with Qtel that they dont have common problem for the speed of that area ( u can check with neighbors to)
--try to reset and reinstall the wireless, turn it off then on..and so on..put password for it

***If problem doesnt exist with the other laptop, then:
--most probabley u been to harmfull website/program/whatever which damaged your computer and u need to have very strong antivirus and antispyware and prefered to format ur laptop..
--lower extent that somebody is logging to your router and keep downloading movies and stuff which will take good share from the speed... so to be in safe change the router (wireless) password

Hope you find this usefull