Use System Restore when nothing else fixes the CAC
windows
Symptoms
Persistent CAC failure after recent changes to the system.
Likely cause
Recent Windows update, third-party install, or driver change corrupted CAC functionality.
Fix
1. Start > All Programs > Accessories > System Tools > System Restore.
2. Pick a restore point from before the problem.
3. Next > Next > restart.
Sourced from militarycac.com. Rewritten for clarity.
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