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Update2 (In case anyone is having the same problems): I tried installing Visilogic 9.8.2 on my problem machine (Windows 10 that was upgraded from 7). I had the same problems when trying to open folders with VLP files after the installation: it would crash explorer if I got anywhere near a VLP file. It clicked in my head that maybe I needed to uninstall, delete the file extension registration for ".vlp" from the registry, then reinstall. I did so, and everything seems to be working fine, now. You can find instructions for where to find the registry key for deleting a file extension association if you just search the internet.

Update: The odd problems of VLP files locking up Explorer whenever Visilogic is installed and the additional error messages that pop up when I open Visilogic seem to be limited to my PC that was upgraded from Windows 7 to Windows 10 that had Visilogic 9.7 on it during the upgrade. I just installed Visilogic 9.8.2 on a fresh install of Windows 10 on a different PC only using the UAC Settings slider to turn off UAC, rebooting, installing, then turning UAC back on and rebooting again. However, there is the extra variable that I used a new installer (9.8.2 vs 9.8.0). So, not exactly a controlled experiment. I will probably try the new installer on the problem PC this weekend and if I still have problems, I'll verify that my upgraded Windows 10 has a valid license and do a fresh install on there, as well.

UPDATE:

UPDATE: I removed every single VLP file from my system and reinstalled. I am now able to open the folders where the VLP files were previously located. However, if I insert the USB key where I backed up my VLP files and open one of the folders containing VLP files, it crashes Windows Explorer. Note in both my previous post and this post I am referring to doing this while Visilogic is not running. I'm beginning to wonder if this is just a new bug in version 9.8.0. If not, there's a serious problem with file type registration on new Windows 10 installs. I will await replies before I decide if I should go back to 9.7.6 or wait for a fix on 9.8.0.

I upgraded to Windows 10 from Windows 7 with Visilogic 9.7.6 already installed. I had no problems at all and was able to continue working as normal. The problem came when I tried to upgrade to Visilogic 9.8.0. I had to delete every single file I could find related to "Visilogic" or "Unitronics" from my C: drive in addition to disabling UAC in order to get it to install properly without throwing the "prvChangeGuiByPlcType" error every time I opened it. Now, every time I open my separate storage drive and even start to go down through the file system to get to a VLP file, it crashes Windows Explorer. This is a VERY SERIOUS ISSUE. My next step will be to uninstall Visilogic again, back up every single VLP file and delete it, go through and delete all app data and anything related to Unitronics (again), reboot, and reinstall. I'll post and let everyone know how it goes.