Windows system can not access the Internet comprehensive solution

The network of Windows operating system has always had such a problem. I have seen many people on the Internet asking questions in this regard, so I will combine some of my experiences with some examples to tell you about Windows system. What should I do after I have no access to the Internet? Software problems 1. Vista can't solve the problem online. The method is very simple. If you have a broadband connection icon (draw) on your taskbar, you can start at the beginning (the ones above the shutdown button). Control panel, enter there you can have an icon (icon style: there is a cable under the four computers, the Chinese version is "network center"), enter him, there are six options on his left side Select the sixth option (Manage Network Connection), enter, you will find a map of two computers, right click on the first icon, select the property button at the bottom, and find TCP/IPv4 in the pop-up box. The words, point him, then click on the button below him (the last one of the three buttons) is the property, here you can adjust your IP address, adjust it to OK. Connect the broadband at the beginning of the control panel The one above can connect to broadband. 2, Windows 2003 can not access the Internet 1), open the registry editor, delete the following two keys in the registry (it is best to export the backup before deleting): HKEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Services\\Winsock HKEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Services \\Winsock2 2), find the nettcpip.inf file in the inf directory of the system directory, open, find: [MS_TCPIP.PrimaryInstall]; TCPIP has properties to display Characteristics = 0xA0 ; NCF_HAS_UI NCF_NOT_USER_REMOVABLE Change 0xA0 here to 0x80 Save and exit ( This setting allows the user to modify the TCP/IP protocol. 3) Open the properties of the “local connection——install ——add protocol——install from disk, find the nettcpip.inf file just saved After pressing "Determine", go back to the list and select the last item "Internet Protocol (TCP/IP)" (there is no icon on the left, note that it is not the "Microsoft TCP/IP Version 6"). Prompt no digital signature Press OK to install. After this step, it returns to the window of the network connection. At this time, after selecting "TCP/IP", the "Uninstall" button is already available (it was gray before this step). Click the "Uninstall" button to remove the TCP/IP protocol and restart the machine. 4) After restarting, change the nettcpip.inf file back, and then follow the third step, re-install the TCP/IP protocol (at this time it will not prompt no digital signature, huh, huh). 5), restart the protocol once installed, reset the connection properties of "local connection", you can network, if not, then restart, huh, huh. I deeply thought that this problem was caused by the aging of my hard disk, which caused the TCP/IP protocol related data to be corrupted, so I quickly put the hard disk ChkDsk, huh, huh. 3, Windows XP can't access the Internet. One of the most common problems that Windows XP finds is that it can't access the Internet. Many people have encountered such problems, and they don't know how to deal with it. Some people even have to reinstall the system. In fact, this problem is not solved. It's hard. First check that there are no icons in the network connection indicating that there is a problem with the network card. The device manager can find out the existence of the network card. The initial judgment is that the network card is in poor contact. First, check if the cable head and the network card are firmly connected. Second, check if the network card is plugged in. It is best to re-plug it. Mainly look at the following two aspects: 1) Some people have problems establishing connections, such problems are well solved, as long as the tools in IE — — Internet Options & mdash; & mdash; open the Connection tab, click Settings, re-enter the password Then determined. 2) If the above method cannot be solved, in the case of ensuring that there is a network card driver (there are many network cards that do not need to install the driver, WindowsXP will automatically install the driver), just enter the control panel ——system—— hardware tab, Click Device Manager, uninstall the network adapter (do not uninstall 1394 network adapter), and then press OK to restart the system. If Windows XP recognizes your network card, it will automatically install the driver. Windows XP will not recognize it and will prompt you to install it. Driver, just install the driver, it will solve the problem. After some network cards are installed, the system will scan for a long time. Then, the connection icon with a yellow exclamation mark will appear in the lower corner. You need to set the IP address yourself by double-clicking the icon and clicking on the attribute in the displayed dialog box. In the General tab of the pop-up, click to select Internet Protocol (TCP/IP), click Properties, select Use the following IP address, and fill in the IP address with 192.168.1.X (X is 2——10 Number, click on the subnet mask again, the system will automatically generate 225.225.225.0, and finally click OK to close this tab, click OK to close the General tab, your network will be able to connect again. 4. Can not access the Internet after reinstalling the system You are starting to open MS-DOS, enter the online network, "ping 192.168.1.1", press ENTER to see if there is any (that is, there is no: "Reply from 192.168.1.1: bytes=32 time=1ms TTL=255" A similar language, there is a pass), if it is passed, it means that you are using the cat to go online, set your route. If you use the dial-up software, the Ping will not work, you can't get on it. It may be caused by software, reinstall the dial-up software. 5. After installing the dual system, you can't access the Internet. Windows Vista and Windows XP dual system may not be able to access the Internet. This problem is generally unrelated to the dual system, the problem should appear. In the TCP protocol. · first enter the command line mode, enter CMD, enter "ld 12; s 127.0.0.1" at the command prompt to determine whether the TCP /IP protocol is successfully installed, if not, re-install the TCP /IP protocol, if General rules go to the next step. · enter “ipconfig” obtain the local IP address and gateway address, by "ping the local IP address" to determine whether there is a problem with the network card, if the ping fails, you need to re-install the NIC driver. If you pass the general rule, go to the next step.