Possibly inference between the AP point and your room. Microwaves and other obstacles in your house can cause this.
Another possible reason is your mode on the router and the mode of your wireless card although N access points are a/b/g/n compatible but your wireless card is a/b/g compatible.
to fix this
Go to 192.168.1.1 and enter admin for the password dialog box and select Wireless and under that Wireless Network Mode under drop down menu select G Only and hit apply changes Now what this does It will allow only G wireless cards to allow access to your internet some times this will work but first check to see if its the fist one.
Also Are you using the the default program use to connect or a application that came with your wireless card
Edited by coxchris, 08 November 2010 - 12:51 AM.
AA in Computer Networking Technology
BS in Information Technology
Comptia A+, Project+, L+