Hi, can absolutely confirm this on Win 8.1 Pro 32 bit. Took me ages to work out what it was, as I only found that wmiprvse.exe no longer used up to 7% CPU after uninstalling unchecky AND a restart.
Conversely, having gone back to an earlier disk image, with Unchecky running, wmiprvse.exe was not evident. However, I was offered 1 windows update: KB2919355. Once I had installed that, wmiprvse.exe started using 3-7% CPU again. Uninstalling Unchecky and restarting again solved the problem with wmiprvse.exe CPU use.
Conversely, having gone back to an earlier disk image, with Unchecky running, wmiprvse.exe was not evident. However, I was offered 1 windows update: KB2919355. Once I had installed that, wmiprvse.exe started using 3-7% CPU again. Uninstalling Unchecky and restarting again solved the problem with wmiprvse.exe CPU use.