Troubles caused by broadband installation

Recently, my child was born and stays at his mother-in-law's home. I have long been thinking about giving my mother-in-law a broadband package, but I am sorry that I cannot access the Internet. In the past few days, I took another public vacation and went idle. After repeated trade-offs, I chose China Unicom's broadband. 10 m optical fiber, unlimited, 600 yuan/year, more favorable than China Telecom. Broadband is installed, but every time you change your computer, it is very troublesome to pull out the network line. From my colleagues there to get a USB-LAN converter installed, not only everywhere is the line, and the USB is not stable, old broken, trouble through. Why don't I buy a Broadband Router? So I went to the computer city to know that the average Broadband Router does not carry any optical fiber. At this moment, we found the long-awaited Wireless Broadband Router. Jin Lang brand, 200 yuan, very affordable. After some exploration, I set up a wireless LAN in my mother-in-law's house. All computers in the network are automatically assigned IP addresses through the DHCP function of the router. In this way, you can use a single network outlet to share the bandwidth of multiple computers. It's refreshing. Just half a day ago, the PC installed with Kaspersky disease in the house in the evening suddenly began to report frequent detection of Trojan viruses, and prompted to restart after deleting the virus file. However, It is puzzling that after each system restart, Kaspersky always reports the same virus. After deletion, it restarts again, and the system starts longer. Judging from experience, there must be a virus background process in the monitoring system. Call up hijackthis to scan the system and find that the system startup list contains unknown information. Program It must be a virus. An error occurred while opening the resource manager and trying to delete the virus. Call the unlock program, stop the associated process, and delete the resource manager again to crash. Call hijackthis again, call the mictool function, and delete the specified virus file after the system starts again. Restart and delete the virus. Kaspersky scanned the entire system and found no viruses. I thought it would be okay. Open the browser and try to access the Internet. All of a sudden, IE prompts that the search page cannot be found. When ipconfig is called, all returned values are 0.0.0.0. The error message "ipconfig/renew" indicates that the file cannot be found. It's hard to explain. Was it because a system file was deleted when the virus was eliminated? I quickly pulled out the antivirus logs and searched them carefully without any important system files being deleted. What is going on? Will it be a problem with the NIC Driver? Uninstall and install the latest driver. After a long time, it's useless, or 0.0.0.0. Almost desperate. The only way to think of it is to find an XP system disk and reinstall it. Because the home PC is compatible, the XP version of Sp1 must be re-activated, think of the previous activation effort, don't worry about it. Put the CD in the optical drive and restart it. I was prompted to press any key to start from CD. I pressed it, but it didn't work. I suddenly remembered that the keyboard was USB-driven and the startup environment was not recognized. The system returns to the Windows interface. I searched Google with my laptop and couldn't find a satisfactory answer. All of a sudden, I had a chance to enter 0.0.0.0 and search for the result? This try, suddenly found the correct answer: http://support.microsoft.com/kb/822123 in Microsoft this document, detailed description of ipconfig appeared 0.0.0.0 Return Value Solution steps. After comparison, we found that the DHCP Client Service on the PC computer was closed and managed manually. Start the DHCP Client Service immediately, and then ipconfig/Renew. Kaspersky immediately pops up a new network configuration warning, ipconfig, and finally comes out of my expected IP address, the problem is solved. Restart the computer. IE is normal. It is 24 o'clock in the morning. The head is almost cracked. Although the problem is solved, it still makes it difficult for me to sleep due to the shutdown of the DHCP client service. There is an article on the Internet Article This article describes the fault that DHCP cannot be started after the Norton Firewall is uninstalled. Because Norton has a service associated with the DHCP Client, DHCP cannot be started. I remember that Norton was uninstalled before. Why? But for this reason, why is everything normal When configuring the network?