Currently seeing "WindowsBlinds does not appear to be installed correctly on your machine. Would you like to try to fix this issue now?"
Using Avira Internet Security (NOT using ESET)
Using Windows 8 with all latest updates as of 1-jun-2013.
The Windows instance was a fresh install as of 15th-may-2013. No conflicting desktop/video/theming products are installed.
Only additional Stardock product installed is Start8 which is still in operation.
WbCore.exe exists and the Stardock WindowBlinds service is runing.
WindowBlinds 7.90 initially installed, and worked as expected, used one theme and never changed it. Restarted just now and this error is evident, there is no equal to HIPS (Host Based Intrusion Prevention) control in Avira as far as I'm aware. If I'm wrong I'd gladly add an exception to directories/files to avoid this issue.
I have tried a complete uninstall including removal of the .bin file in ProgramData. Reinstalled using version 7.91 it was still aware of the previous skin (is this in a registry entry not removed on an uninstall?) but would not apply it (or any skin) at all, each time resulting in the same prompt to "fix the issue". I've tested this on two systems very equal, minimal, and from scratch installations of Windows both with Avira IS (differing only in a few hardware/driver details, AMD 790X vs 990FX, Intel 520 vs Samsung Pro 840)
I can't be sure but seem to remember restarting and seeing it working at one point but possibly before Avira had eyes on it. So I take it this particular product may have been flagged by Avira as overly "intrusive"?
Anyway, great product, look forward to hearing back from you and seeing the product running again.