Viruses and Trojans are a very serious threat. In most cases, anti-virus programs cope with them, but sometimes the user is faced with a situation when, due to a Trojan program that has penetrated the computer, the operating system is blocked.
Instructions
Step 1
The operating system is usually blocked by ransomware Trojans. When infected with such a Trojan horse, the computer is blocked, and a window appears prompting you to enter the code to unlock. This code is proposed to be obtained after sending a certain amount to the details indicated in the message.
Step 2
If you are faced with this form of fraud, never follow the lead of ransomware and do not send money to them, if only because there is no guarantee that you will actually be sent a code. In addition, it is the users sending money who support and encourage this type of fraud.
Step 3
In the event that you have two operating systems installed on your computer (this option is very convenient and useful), boot into another OS and go to the websites of antivirus manufacturers. On them you can find many of the existing codes for unlocking. For example, take a look here:
Step 4
Even if the operating system is unlocked, traces of the Trojan program remain on the computer, which can cause certain problems. Use free utilities from antivirus software manufacturers to clean your computer. For example, this one:
Step 5
If you do not have a second operating system or the ability to access the Internet from another computer, there are two options. First, and the best, install a second OS. If you have two or more hard drives, install it on one of the free ones. If there is only one disk, split it into two using the Acronis Disk Director utility. You will need a utility that works from the installation disc. With the second OS installed, you can start restoring the main operating system.
Step 6
The second recovery option involves using a Live CD with an operating system that boots directly from the CD. Usually this is a slightly stripped down, but quite workable version of Windows XP. Having loaded "under it", you can go to the websites of anti-virus software manufacturers and try to unlock your computer.
Step 7
If, despite all attempts, it was not possible to unlock the OS, there is only one option - after booting from the second operating system or Live CD, save all important data, then format the disk with the locked OS and reinstall it. When formatting, choose full formatting rather than clearing headers. After installing a new operating system, immediately install the anti-virus program and update its databases.
