Why can't Microsoft Safety Scanner complete a scan?

[Windows 7]

Hello. I tried to use Microsoft Safety Scanner-1.421.1757.0 to clean the computer on Windows 7. The Microsoft Safety Scanner-1.421.1757.0 program starts and scans a hard drive for more than 48 hours. I start scanning in full scan mode. I see how Microsoft Safety Scanner to sequentially check the system files first, then all personal files on the unsystematic sections of the disk. I see the number of identified infected files several hundred. However, when Microsoft Safety Scanner -1.421.1757.0 has already scanned all the files on the hard drive, it begins to scan the last Boot.sdi file on the

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