Computer can only on QQ can't internet how to do

Today's computer QQ and fetion suddenly can not be used. But I do not know why the Web page can open. Baidu on the internet a bit found that there are a lot of QQ can be on the page but not open. I was depressed. Looking for a long time. All of a sudden, my computer is fine again. Don't know what the problem is. A preliminary summary may be that I start the software upgrade. A total of 20 software I let him upgrade at the same time, the use of too much speed. There is my upgrade of the software has QQ and Fetion bar. Cause I have been unable to surf the internet.

See a lot of computers only on QQ can not surf the Internet. I'd like to tidy it up, please. I met a time-saver later. Here are some of my summaries.

1, set up the agent to surf the Internet, this situation mostly appears in the company, some companies do not let employees on some specific sites, and employees in order to these sites will be set up agent Internet, just need to cancel the agent can be. Specifically, right-click on the IE Select Properties---connection-LAN settings, the inside of the settings can be canceled.

2, network problems, in a few years ago, a well-known domestic software has caused a large area broken network, the reason is the DNS parsing error, take Baidu as an example, click Start-Run input cmd and then input nslookup a URL, if there is no Figure 2 red circle Similar content indicates that the site problem, only need to wait for the site itself to solve.

3, IE damage, this is more common, the best way is to reload a browser. If you fix it, you need a CD. Re-download a browser on the Internet to install it.

4, infected with the virus, this situation is more, you can use antivirus software to clean the computer virus.

5, the system file is lost, the solution is to put the system CD (genuine original) in the Run menu input sfc or scanow.

6, hardware and software conflicts, the solution is to uninstall the recently installed software, and then restart press F8, select "Last Known Good Configuration" can be resolved.