Does your PC have abnormal processes or unknown applications? Does your PC slow down tremendously? Does your IE (Internet explorer) always ask you whether you want to run some ActiveX plug-ins or debugging scripts? Typically, these are signals indicating that your PC has been infected by viruses. The following will show you how to clean a virus-infected computer step by step.
What people tend to do when their PCs are infected by viruses is to reboot their PCs. Actually this practice is totally wrong. When your PC gets viruses and you try to reboot it, you may suffer from greater loss because you are able to accelerate the virus infection and lose all data on your PC in this way. Therefore, when your PC is infected, the first tip is: do not reboot your PC immediately!
(1) The first thing you need to do is to disconnect the internet and the simplest way is to take your internet cable out from your PC if it is wired network.
(2) The second step you need to perform is to back up your important data on the infected PC. You can use a USB flash drive or optical disk to back up your important data.
(3) The third step is to kill viruses on your PC completely. You will have to enable your internet connection now. Then you will need to update your antivirus software and then run a full scan. There are various latest viruses being created each day so updating your antivirus is a possible solution to fight against the latest viruses.
But sometimes there will be exception. Even though you have tried to update your antivirus software, the viruses on your PC will not be completely removed or they even disable your antivirus software. In such circumstances, the virus will require manual removal. If you fail to remove it by yourself, you'd better ask someone else or try to find some good virus removal support to help you before the viruses cause more damage on your PC.
(4) The fourth step that you need to do after you clean the virus altogether is to change your all kinds of accounts' passwords. For example, you will need to change your Email / Face book account's password.
(5) A final tip is: if you are a LAN (Local-Area Network) user, you will need to check whether other computers within LAN are infected by the same viruses. If yes, you will need to remove all viruses on other PCs, otherwise, the viruses may spread on your PC again via the LAN.