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you probably lost your drivers for your internet adapter. go to your device manger and check to see if there's a problem and if so reinstall driver's from install disk- if you don't have the install disk then truy using a windows xp OS install disk and ask windows to update driver's for network adapter.
c:\windows\system32\drivers\usbport.sys
c:\windows\system32\drivers\usbport.sys
parport.sys - usually located in C:\Windows\system32\DRIVERS\
Many wireless adapters work with Windows 7. If the product does not have an explicit Windows 7 driver, the Vista driver should still work.
Ndis (network driver interface specification)
a disk driver
Yes, it will you get driver for your adapter from the adapter's manufacture website.
To get a wireless adapter to work with Windows XP (or any version of Windows), you need to install a device driver. This is usually provided by the manufacturer on a CD. If you have lost the CD, you can usually also download one from the manufacturer's website.
You can use a program called NDISWrapper. It will use the Windows driver for your network card and allow it to be used in Linux.
There is no the LAN driver. Each model / manufacturer of a LAN adapter has its own device driver. The best driver is thus usually the latest one intended for that specific model.
Basically the entire computer is the communication system. If the question is more specifically how the computer communicates w/ the interwebs.. your answer would be the network adapter. For example, wireless adapter, network card, or USB supported network driver for for a direct connect w/ a broadband device.