An important caveat is that some viruses can disable your antivirus and make it impossible to run it, which will make it impossible to remove the virus. However, do not worry because this problem can be solved by running OS in safe mode (the mode when only the main programs are loaded). In this mode, all installed background programs will not be started, and you can also use this mode without access to the Internet and then there is a chance of launching an antivirus program and checking the system for the presence of a virus in it.
The third way
You can call it one of the extreme methods, but it's not so bad. This method consists in restoring the system of its previous form, which was at the time of archiving. In order for industry email list this method to be available to you, it is necessary to archive your system once in a while (week-month) and store it on a separate media, for example, a portable hard disk or a flash card. Thus, having picked up a virus on your system, you will be able to get rid of it without losing all the files, but simply returning to the original state that was some time ago.
The fourth way
The most extreme method of getting rid of the virus in your system is to reinstall the OS and format the disk. Since this is the most unpleasant method, you should try using the second method, but if it did not help, then there will be no choice and you will need to reinstall the system at the same time, unfortunately, having lost the files that were previously in your system. However, do not worry using additional utilities you can restore files that have been erased.