The fact that the process of scanning your computer requires additional resources that may affect the speed and performance of your computer . This is especially true for low-power computers, and for computers that have installed a lot of different software. If during your work on the computer will automatically check — this can lead to a serious slow down until the complete inability to do anything. In such cases it is recommended to configure automatic check so that it was carried out , for example, at night. Under Actions, by default , the contents of which is shown in Fig. 8.10 , determined by the program in relation to the suspicious programs , depending on the degree of danger they present. Fig . 8.10 . Setting the default program action Of the danger that can come from malicious software , Windows Defender divides into three categories: high level of danger , the average level of danger and low risk. A high level of danger are programs that can perform the collection of personal and private information or cause damage to your computer or operating system , for example by changing the system parameters , and always it is done without the knowledge or consent of the user . Intermediate danger comes from programs that may affect the safety of confidential information, as well as change the system so that it can cause serious performance problems. As for the programs of the low level of danger, these include applications that can perform the collection of information about the user or computer, or edit the parameters of the operating system , but at the same time working in accordance with the license agreement , the text that is displayed in the their installation. Malicious programs , representing the highest level of danger, in the Actions section by default (see Fig. 8.10) from the drop down list to choose one of three possible behaviors of the program: • Recommended action based on definitions — in this case, Windows Defender will decide on how to proceed with a malicious program on the basis of information contained in the signature bases.