Internet connection in W7 fails

[tymann]

I use a network

The windows XP allways connect easily to the internet (ADSL + router). (explorer and firefox)
One W7 machine often fails to connect (explorer and firefox); I have to try several times to connect.
Who helps out?

 

[Guest]

Driver for the wireless adapter or network adapter ?

 

[tymann]

Driver for the wireless adapter or network adapter ?

No drivers are OK

FW