If sfc doesn't find any problems, boot to a Linux Live CD/DVD and see if USB works without issue.
NSA Homeland Security PRISM Denial of service Malware Trojan Keylogger Cyber Command
2600 Backpack Phishing Rootkit Agro Eco terrorism Conventional weapon
Target Weapons grade Dirty bomb Enriched Nuclear Chemical Biological weapon Black out
Pressure Cooker Grid Power Smart Body scanner Electric Failure Ammonium nitrate Brown Out
Bridge Organized crime National security State emergency Security Breach Threat Standoff
SWAT Screening Virus Environmental Terrorist Dock