Weak wireless signal strength

If updating the drivers and tinkering with the card configuration doesnt help, there are only 2 options. Either junk the builtin card and replace it with a new card- this can be internal or an external wireless dongle. Or if you have a spare router lying around, you can use that as a wifi extender. This trick is also very useful in large houses. To do this- draw up a CAT5 cable from the LAN port of the mother router to the room/place where the signal is not picked up (you'll have to plan how to take it across the barriers) and plug it into a LAN port on the spare router. Now, if DHCP is enabled on the main router, the spare router will aotomatically get assigned a valid ip- if you use static ip's, you'll need to manually assign an ip in the main router's range.

Keep DHCP and NAT disabled on the spare router because those functions are being handled by the main router. You'll need to assign a name to this SSID and a security key depending on what encryption you're using (use the same security key as the main router). Now you'll have a wireless network in the problem area with good strength. When you move to the other room, the wireless card will disconnect from the previous network and connect automatically to the new one (if set to connect that way). In the grey area between the 2 routers, you may need to manually pick.