i have a old t9100 laptop when i use wireless it freezes but if i conect to my cable modem it works fine hope someone can help it used to work fine i have not changed anythink on it .
initial thoughts are: bad wireless card. Try a PCMCIA wireless card or replace the internal wireless card. Trying a PCMCIA wireless card 9these are a "dime a dozen" now, may help you to isolate the problem first.