If you only want to solve the USB issue, Intel's official tool is your best bet. You can download the from the Intel Download Center.
Standard Windows 7 installation media only includes USB 2.0 drivers. Without this specific hot driver, none of the blue USB 3.0 ports on your EliteDesk 800 G2 will function.
Get the HP EliteDesk 800 G2 SFF Drivers for standard compact office configurations. hp elitedesk 800 g2 drivers windows 7 64 bit hot
Let me know how you would like to proceed with configuring your hardware. Share public link
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Windows 7’s built-in Wi-Fi management is flaky with these drivers. Use the Intel PROSet Wireless software included in the driver pack.
You cannot access the internet without these. If you only want to solve the USB
HP provides official driver packs exactly for this purpose. The most comprehensive one is , specifically designed for deploying Windows 7 64-bit on the EliteDesk 800 G2.