Windows 10: Icons gone pls read the details

I know Microsoft word converts a pdf to editable word file..Now the issue I m facing

1. I opend the Word 2016 version

2. was browsing for a pdf file from my pc

3 .I noticed in the browsing search box while loading all the pdfs from user folder the icons were changing means files were in adobe format but thumbnails were showing the contents inside the pdfs were clearly visible like a image

4. Everything was fine I opened a pdf in word


**Now **problem**

When I went back to User folders for those pdfs the thumnail, icon all gone ,totally blank ,pdf names were there only and search boxwhere folder name is shown is continously loading and loading ...


Pdf files were in middle icons size

I can open them

If I change the view into any type like list ,large,icons come again but when I come to middle icon view and refresh once then they again gone blank and starts loading & loading..

I have deleted them again restores, restart the pc nothing happened..

Kindly help me to resolve this..


Probelm stars from word browsing search box..

:)

 

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