Internet isn't working

[iampriteshdesai]

Hi!
I have wired internet, using Ethernet.
Now my internet doesn't work in Vista, says I have driver problems... PCI card (smartlink) and Ethernet card (which happened when I was troubleshooting this thing). I don't have any drivers for these things.
Internet however works in Ubuntu..
but after few hours it stops working... I get an message, saying auto ethernet disconnected..
I works well initially.
what should I do

[Iowan]

Does it work if you restart the machine?