Chrome warns connection not private.

[Admin]

Check the certificate path and dates on the certificate, that can give some clues as to where it fails,
try reinstalling chrome

Some security software also load certificates into windows so if you have one installed already try reinstalling

But my best guess
Windows 7 ?
what you installing that ancient OS for?
if it's a new clean install, do some windows updates, maybe there is a root certificate update that is needed.

IKR, its getting on, its for someone who wants to keep some legacy apps they like to use.
Now heres the weird thing, im also having issues getting the windows updates to work.
And ive tested internet explorer and i get page not displayed on most sites.