Weird Networking

[kronos_fir18]

OK here's d probs,
i'm using the wireless connection through my wifi connection,

First situation

In network n sharing center, it show --- connected to local and internet in the form of this SSID -- ''MY SSID''------------but there no connection at all...
try to ping google,no luck...but managed to ping the router n modem..

second situation

Network n sharing center show --- connected to local and internet
SSID form --- ''MY SSID 2'' the connection is available n managed to go to the net

that is the first probs...

second is,when on ''MY SSID 2"
sometimes the connection is not stable n change back to ''MY SSID'' i dnt even noticing bout the changes until i wont able to load the page...

then i need to go on command prompt n do ipconfig/release and ipconfig/renew command to get connected to ''MY SSID 2''....

*sigh,,,,i dnt even know wat happend.... btw i'm on windows 7...(sumtimes vista also like this but d networking is stable. n also it's SSID is vice versa on windows vista)

help.. how to solve this weird phenomenon?
my XP lappy didnt have such kind of probs.

thanks

anyone? basically i need to renew the ip..using ipconfig/release and ipconfig/renew command.