Probably, everyone knows what antiviruses are and what they can do. But antivirus as a means of removing malware is not always convenient. To constantly monitor the system, it consumes too many resources, and to conduct periodic checks, you need to allocate time. On old and slow computers, the presence of antivirus loads the system very much.
Another reason why antivirus software is not always the best malware removal tool is to reduce the life of your hard drive. The presence of an antivirus at times increases the load on it, and if it already has “bad” sectors, it is better not to risk it.
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The main advantage of any virus removal tool is that it can only be launched at the request of the user.
In many cases, he does not have to be in memory all the time. Although it depends on the specific purpose of the utility.
And for any tool to work well, it, like the heavyweight antivirus, needs to update its databases from time to time (in some cases, you download not the database, but a new build of the program).