Kaspersky Security Cloud offers multiple scanning options: "Full Scan," a lengthy process that checks all system files; "Quick Scan", which only checks objects loaded into the OS at startup: "Selective Scan" allows you to select individual objects or partitions for scanning, and "External Device Scan" which checks your CD/DVD and USB flash drives. others.
Also, select "Task Manager" and scan your already running processes. This feature can detect infiltrating processes running on your system under different names.
Some antivirus processes can become exhaustive at a given moment due to continuous window pop-ups, system notifications, webpage blocking and others. This will push one's patience to the limit, but hopefully disabling those features can avoid all the problems mentioned.