'Word could not create the work file. Check the temp environment variable.' What is the simplest way to resolve this please!

When I open Word I get this message every time: 'Word could not create the work file. Check the temp environment variable.' Word then crashes very often without autosaving. 

I've found many people asking this question but I utterly do not understand the answers people have given them! Is there a simple way to resolve this - I know literally nothing about computers! Please help with the easiest solution possible.

Many thanks!

The error message "Word could not create the work file. Check the temp environment variable". Can be caused by incorrect registry values in the key:

HKEY_CURRENT_USER\Software\Microsoft\Windows\Current Version\Explorer\User Shell Folders.

Click Start and in the start search field, type

Regedit

and press enter.

In the registry editor, browse to:

HKEY_CURRENT_USER\Software\Microsoft\Windows\Current Version\Explorer\User Shell Folders

On the right hand pane, check the value data for Cache.

It has to be %USERPROFILE%\AppData\Local\Microsoft\Windows\Temporary Internet Files.

If it is different, double click on Cache and type:

%USERPROFILE%\AppData\Local\Microsoft\Windows\Temporary Internet Files

under value data and click ok. Close the registry and  restart the computer and check if it works.