Vostro 3471, 4GB ram, 100% disk usage

We have recently purchased 6 Vostro desktops in our office with Windows 10 (64) Home, Core i3 9100 CPU 3.6 GHz, with 4 GB ram. Every time after booting up, they all have 100 percent disk usage for about 30 minutes. PCs lag this entire time. This happened even before installing the necessary software we needed. Hoping some help on this issue.