hidserv.exe is the windows human interface device service. It monitors your system for when you plug various USB devices in. More information can be found here.
Microsoft? Windows??98 and later versions provide built-in support for devices compliant with the USB Device Class Definition for Audio Devices, Version 1.0 (see http://www.usb.org/?), and for audio control devices compliant with the USB Device Class Definition for Human Interface Devices (HID), Version 1.0 and 1.1.