Have tried disk clean up and pausing and re-starting OneDrive sync, but I'm still getting the green line and generally sluggish performance. Also interesting to note that the 'zip' feature is not working properly - i.e. when I send files to a new zip folder, they cannot be opened afterwards - it's like the whole process is just hanging.
I have begun to wonder whether I might have a virus, so yesterday clicked on Windows Defender (it's all I'm using for this) in the Control Panel. Whatever I do, Defender won't open. Looking then at Windows Update, I notice that a couple of important updates (virus definitions for Defender) have failed to install.
Running the Update Troubleshooter doesn't work either because when I click on it, it says 'requesting security scan' and then 'security scan paused'. In fact the some thing happens when trying to open pdf files downloaded from the Internet - I cannot open them.
I'm loath to do yet another refresh. Do I have any other options?