Dell optiplex 360 xp USB drivers

Hello and welcome to Tom's Hardware Forums.

It's very unusual for a system to lose its USB drivers. On the casing somewhere is the Service Tag and if you visit or your country's local Dell site and input that in the Support section, you'll be directed to the precise drivers for the equipment that was installed on you particular machine.

That's the safest place to go if clicking on Update Driver in Control Panel>System>Hardware>Device Manager>Standard PCI USB Controller - or all five or six of them - doesn't do the trick.

What actually isn't working your machine - one USB Port or all of them?