Search not finding files

My file search is not finding files which I know are there, including files that I find and then try a search to see if windows eight can also find them. I have tried all the solutions' offered by googling 'windows 8 not finding file' such as the troubleshooter . One suggestion was to change the location of where to search to 'everywhere' but this option is greyed out.
Any ideas?

Hello Trevor,

You might see if the items in the yellow Tip box at the top of the tutorial below may be able to help with your search results.

http://www.eightforums.com/tutorials/4595-search-windows-8-a.html

Hope this helps,
Shawn

Aha the first thing I see is the word BING. I have always regarded this 'thing' whatever it is as a curse and removed all signs of it - is this where I have gone wrong?

No. Turning off using Bing search results will just not give you search results from Bing. You should still get them from your local PC.