usbstor.sys, and usbstor.inf

Support Information:
Device Type: Input Devices (mouse, etc.)
Manufacturer: Compaq
Model: sr1630nx
Interface: USB
Operating System: Windows XP Home
Age of Device: < 2 years old
FCCID:

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=236&qa5=9&qa7=1500&dp=2&qm0=sr1630nx&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=Compaq+Input+Devices+%28mouse%2C+etc.%29++sr1630 nx+Windows+XP+Home+) | Research manufacturer Compaq (http://members.driverguide.com/index.php?action=getinfo&companyid=236)

both these files are included with the OS.