My laptop connect to wireless networks except my network

I have a laptop in my home that couldn't connect to my network, it shows exteremely weak signal for my wlan, I have mac filter in the router, and checked that mac address is added to the filter, encryption configuration is fine, and it was working before a week , it can connect to any other network in other places except mine, I tried to take the laptop to my work and wireless is working so fine.

what could be the problem ?

Can another laptop connect to your wireless router without any problems?
Disable MAC filtering temporary, just for testing
Disable WPA2 encryption on router temporary, just for testing