walls are dissapearing when placing paint or wallpapers down

Yep, it's a safe app to use. I wouldn't have used it if I haven't seen it being recommended by customer supports. Had some issues once with an app on my PC and this was recommended to me as well ^_^. I'm pretty suspicious when it comes to installing programs I haven't heard of before, so I understand you 🙂). 

You can perform an antivirus scan just in case after installing/using it :D. 

There were some errors I've seen in the dxdiag, that's why I was asking. Because sometimes, Windows files can get corrupted and affect programs/games/etc. 

Let me know how it goes! And don't hesitate to ask questions or add more details.