Malicious software (viruses, Trojans, etc.)
Programs of this type get into the system due to the lack of high-quality anti-virus protection, or by mistake of the user. For the "treatment" of the system should be written to a USB flash drive or CD/DVD-ROM antivirus program and run it on your computer. Running an antivirus program is recommended in safe mode Windows. To do this, when the computer restarts, press F8. If a menu appears select the boot device (Boot Device), select the hard disk where the operating system is installed, press Enter and F8 again.
In the list that appears, select using arrow keys "Safe mode (Safe Mode)" and press Enter. The system will boot in safe mode, after that connect the media with an anti-virus program and run it. When you specify a system scan to check all local disks, because the virus program can copy itself to different folders on the computer. After finishing the system scan, follow the instructions the antivirus program in further action with the detected malware.
Modified hosts file
Some malware can change the operating system files. Often prone to change the hosts file, as it is responsible for the network connection. Using the Internet, determine the contents of sound file host. To find the hosts file, open the local drive where operating system is installed ("C" by default), then follow the path: Windows-System32-drivers. Open the hosts file using Notepad. Check the information contained in the file, it should be appropriate "healthy" the host file. All incorrect lines must be removed. After that save the changes and close the file.
To check your registry, you should run command prompt by pressing Win+R or by selecting the start menu-Accessories-Run. In the window that appears, type regedit and press Enter. In the window that opens go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\
Highlight the AppInit_DLLs line and press Ctrl+X. Save the changes and close the registry window. Open Notepad and press Ctrl+V. Save the resulting text file, and then restart the computer. After you start the computer, open the created text file and pass it the specified address, delete the file.
Advice 2 : Why the page cannot be displayed
With this message are faced by many Internet users. But not everyone understands why this is happening, and trying unsuccessfully to find the answer. Let's take a look and find out why.
Seeing the message "Cannot display the page" in your browser window, no need to be afraid and to panic - there is nothing to worry. Most likely, the fact that you have lost Internet connection and just need to recover.There are also several other causes of this message. One such reason might be deleting or changing system files in the operating system, such as Winsock.dll, Wsock32.dll and Wsock.vxd, or one of these files is in the wrong folder.The second important reason may be incorrect or the actions of the malware damage to the WinSock2 registry key. Antivirus programs and firewalls can also be the cause of this message.The third factor can be working or incorrectly configured proxy or firewall operating system. Often the reason for the appearance of the window that says "Cannot display page" are viruses that block your Internet connection.Another reason may be an incorrect entry in the system Hosts file, or have your browser settings changed unexpectedly, for example, there is a tick on the item "Work offline". It is also possible that website or resource, when trying to access that you have received this message, currently unavailable or disabled. Try to visit another site.You may have incorrectly specified the address of a site or resource you are trying to access. If all the above reasons exist, the problem is likely your ISP or communication lines. Call your provider and ask, or currently being now repair or maintenance work.
Advice 3 : Why not open the web page
The unavailability of a particular site or even individual pages on the Internet can be caused by various reasons. Among them, preventive maintenance, carelessness of the webmaster, as well as the incompatibility of the site with a browser.
It so happens that the same site is available to subscribers of one provider, but users of other. The reason is that a chain of intermediate nodes through which packets from the server to the machine user, is different. To determine which nodes are involved in Linux you can use a traceroute utility, and in Windows with tracert. And if one of them is unavailable, "reach out" to the server is impossible. Then you have to use the services Skweezer, Google GWT, Opera Turbo or similar, but in any case not anonymizing proxy servers - in this case, the site owner can take you for an intruder!
The page may not open because of a typo in its URL. Then I get a message saying that the file was not found - the so-called "error 404". In the case if typo is allowed in the domain name, you may hit on a fraudulent resource. Often it looks like real, and then the user enters his data from his account. It threatens abduction of such data by cybercriminals.
Even if you correctly typed in the full url of the page it will not appear if the site owner had accidentally deleted it. Also it can move, and then all the old links to this material will be invalid. Moreover, often in haste webmaster forgets to fix such links even on other pages of their own resources.
When the hosting provider performs the prevention, not be available all or some of the sites that it services. Individual resources also become unavailable when they are updating the owners. But if a link to a small online post on another, large, it begins to move a significant number of users. The server is overloaded, and a so-called Slashdot-effect. Its name he received in honor of major site Slashdot, posting links which often leads to this effect.
Subscribers some ISPs are faced with situations when access the web page the major resource is blocked under the pretext of the availability of extremist material, though in fact nothing of the sort on these pages no. Not to allow any content provider is required by law, only to fulfill this obligation, he may negligently and instead of separate pages to block whole domains of the second level.