Kaspersky Anti-Virus has a layered defense posture that can scan a system quickly without confusing the user with annoying false positives. It took us a bit more than 5 minutes to download and install Kaspersky Anti-Virus. Kaspersky’s servers sent a 164MB file that first did an initial system scan, and extracted its own components and went through the installation. It takes very long time to complete a full scan and about 5-6 minutes for a quick scan.