I tried the older 9.9.2_3 driver, and I got the same printer error upon restarting my computer as I got with the NDIS-6 installer. It seems that Avast Antivirus may not like the TAP driver, as I noticed avBugReport.exe running when I started the machine. I deleted the network bridge and tried to use the supplied batch file to uninstall the TAP, but I couldn't open any command prompts, and with the network bridge gone, I had no network connectivity. I tried recreating the bridge (which restored network connectivity) and waited five minutes or so for the Avast bug reporting to finish (and for sppsvc.exe to go to sleep), but the PC froze. I could move the mouse cursor but do nothing else, so I had to power off.
I started Windows normally again (which generated another printer error in the log), and this time avBugReport.exe wasn't running, so I quickly deleted the network bridge again, ran the TAP removal batch file, and then ran the tap-windows uninstaller to remove tap-windows completely. After reconfiguring my Ethernet adapter, running chkdsk on my drives, and rebooting again, the printer error is again no longer appearing in the event log, and I'm (hopefully) back to where I was before I installed 9.9.2_3.
I also noticed that when I installed both the NDIS-5 driver today and when I installed the NDIS-6 driver a little over a month ago that the event log shows "Event ID 4107 Source: CAPI2" errors about 27 times when I ran the installer:
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Failed extract of third-party root list from auto update cab at: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab> with error: A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.
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I'm not sure if that's related, as I have other instances of the error in the log, but the last one was from about a year ago and is thus unrelated to OpenVPN, and I didn't receive further instances of the error after the driver installation was complete. I'm kind of at a loss as to what to do now, so any help would be appreciated.