NO Data Flow

Messages
1
Location
NA
ISP
Airtel
I have a peculiar problem .Frequently i am not able to browse or download .My link is alive .my Modem(Connected in USB port,since no Ethernet card ) shows that data flow is also correct.but i am able to browse only after switching off and again switching on the modem.i have airtel 256kbps plan.what is my prob ,whether it is modem or usb port or OS ???
 
USB have problems... but a lan card after checking for space or it... its very cheap..
 
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