I have now lost 6 hours with this very same error.
I Had a blue screen for an unrelated error, while the headset wasn't even connected. Which forced the system to restore to a previous day. On rebooting the headset was no longer detected by SteamVR.
I tried repairing the viveport install to no avail. Tried uninstalling everything to do with htc & vive to no avail. Did a registry clean of any htc crud to no avail.
I can't even download and install the viveport app, because it fails with the " Download Failed, Please check the network connection and try again". Obviously there is no dam network problems cause i can post here with my frustrations. $1200 and i haven't been able to properly use my headset yet.
I've rebooted many times, tried various usb 3.1 & 3.0 ports and fully deleted anything to do with Vive from the system.
I can't get past the Download Failed prompt at the beginning of the install process.
As you can see from the attached file, there are NO Tracking drivers installed. How can i source them if the download fails from your servers.
How can I do a full reinstall from scratch with all the initial connection prompts again??