|"In any case we would need more information on the type of network you are using, WiFi, Network Card, etc."|
Wireless network connections are always flakier than wired network connections, especially if you're using wireless B or G, and are directly dependant on how good the signal strength is between your wireless adapter and the wireless standalone router, or the combo wireless router / ADSL modem.
If the problem is caused by the ADSL connection itself having a poor connection, or no connection, there is probably no command that you can use in Windows to correct that.
ADSL connections are directly affected by the amount of electric and electronic noise being picked up on the telephone line, whether you can hear that when you pick up another phone on the same line when you're having connection problems or not. When there is more line noise, you're a lot more likely to have a poor internet connection, or no connection at all.
When the connection is poor, or even when it fails, there's often no visual indication of that from the leds on the modem or the combo router / modem that there's anything wrong with the ADSL connection. .
The first thing you should try when your internet connection is poor or fails is to "re-boot" your standalone ADSL modem, or your combo router / ADSL modem.
- if it has a power switch, switch if off, then on.
- if it doesn't have a switch, unplug the AC adapter's plug, by pulling on the plug, NOT the cord, where it plugs into the modem or combo router / modem, plug it back in
- in either case, WAIT a short time until the leds on the device show you actually have an ADSL connection.
If you're connecting wirelessly to a standalone wireless router, you may also need to "re-boot" that.