1. When Kaspersky was scanning files, it encountered a very large file or a file that just wouldn't budge (this file is likely to be a virus). Maybe when it was scanning a certain file, it got stuck and couldn't proceed. Or while scanning, the space it called upon exceeded the space you had left, and the computer couldn't handle it, so it crashed... Pay attention to whether it crashes when scanning a particular file. If it doesn't work, try switching to an antivirus software that takes up less space. (For example, Nod32...)