Glad to have you here, craggywaggy.
Windowblinds doesn't alter your System files as 'other' software (msstyles and the like) do.
If you have any problems using Windowblinds, users/subsribers are a very helpful crew, and will try to aid you. If that situation should arise, posting in the Support Forum here for Windowblinds can get quick attention. When doing that, copy and post the info in the "About" tab in the Windowblinds Config window (where you can choose a "skin").
You can also send an email to firstname.lastname@example.org but don't reply to the 'autoreply" you will receive that will only kick your request for help to the end of the queue. Save that autoreply as it has your ticket number. Also, if you don't see a response after 24-48 hrs, check your email 'spam' folder for it. Only respond after an actual person contacts you. Remeber to put as much info in your request for help to speed up communication. Include that "About" info.
If you have had a msstyles type of app on your system, I would suggest running sfc /scannow as the 'Administrator' in your cmd. That will fix any System files altered by such apps.
Again, welcome to our Community.