Hello,
There isn't details of your configuration but I would guess you have an outdated Windows 7 installation. That driver is signed by Microsoft and, if your computer might not have the latest Microsoft digital certificates.
Graphics drivers are used during Windows startup. That's not DisplayLink's design but Microsoft's. That's why you need to reboot each time you change graphics drivers. If we could do without reboot, we would more than gladly do it.
If you don't have an outdated Windows 7 installation, then maybe you have a corrupted hard drive like the error suggests.
DisplayLink has not released any new driver lately, so unless you have manually done something, then the issue comes from elsewhere.
Kind regards,
Alban
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