Hello seanhc. I understand the computer is unable to view certain USB devices. Fortunately, Microsoft produced a document that contains troubleshooting to address the issue: http://support.microsoft.com/kb/2830154
Since you will be editing the registry, if you follow this document, please back it up first. Please reference this document if you require assistance with this task: http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c01817264
Please respond after you complete all of the troubleshooting. I'm only here to help!
Mario