Windows 10 64‑bit and Windows 11 enforce driver signature verification , which only allows drivers with a valid digital signature to be installed. Older VOCOM 1 drivers may not have signed INF files.
After major Windows updates, driver signature enforcement may be reactivated, or existing drivers may be overwritten. Use the Tech Tool Support Tool to perform a complete removal of PTT and all drivers, then reinstall the VOCOM 1 driver from scratch. You may also need to disable driver signature verification again if the issue persists. vocom 1 driver download
Locate the downloaded file (usually a .zip file or an .exe installer). If zipped, right-click and select . Windows 10 64‑bit and Windows 11 enforce driver