Have you secured the router appropriatly? (someone could be bugging you by changing the settings) see
Secure your wireless network
for information about securing your network appropiatly
To improve the wireless signal (get a better signal)
- Download
Netstumbler
- Instal netstumbler and restart your pc
- Start netstumbler and goto ssid's (on the left)
- Select your network id and expand the menuitem
- Now you see the signal strength
- Adjust the position of the router and the antenna's of both the router and your wlancard untill you get the best signal
Aside from adjusting the antenna's a low signal/speed can be caused by:
- the usage of a wireless chanel allready used by other people in your neigbourhood
- the presence of thick walls, electric devices or metal near the router or computer
- using WPA security when having a low signal will severely drop the speed and give you timeouts