If you are one of those people who is getting annoyed by re-appearing password prompts in SharePoint, join the club! Luckily there is a fix!
The problem is limited to Internet Explorer web browser and only to the cases when user is trying to open MS Office files (Word, Excel, etc.). Step-by-step instructions on how to fix this issue are detailed in below presentation. If you still experience issues – drop me an email and we’ll try to resolve it together. Another quick fix would be switching away from Internet Explorer Web browser to other alternatives.