I have on one computer two users, one for me and one for the wife.

Now when I switch over to my wife's account I cannot open Chrome on this computer, it would just not open - unless I go to the task manager and kill all active chrome processes. Still not really a success as Chrome thinks that it is still me and not my wife opening the window and says that it crashed and wants to restore MY session, but not my wife's session. Only when I decline, I can login to Chrome with my wife's google account and use Chrome as I was her. Switching back to my WINDOWS user same problem. Now Chrome thinks it's my wife using my windows login and she is logged into my Chrome and of course nothing works properly.

How can I teach Chrome that when I switch the windows user that there is someone else sitting in front of the box as one would think is normal??

Maybe add a new user to chrome

See here https://support.google.com/chrome/answer/2364824?hl=en

As far as I know, Chrome will be installaed "per user" with the standard installation procedure.

Seems like different users could even have different versions (languages?).

Here is something about the topic:

https://support.google.com/chrome/answer/118663?hl=en-GB

Thanks a lot for the advise but this "alternate installer" doesn't do what promised. Uninstalled Chrome, installed under my user with the alternate installer but still, under my wife's account I cannot start Chrome as long as there is any active Chrome instance under my user.

Installed now Opera for the wife, she will probably not notice the difference.....

May or may not apply, but I set up my Win 7 so that only administrator can install programs. And when I install as admin, it asks me if I want to install for all users or not. Could you have such a default set that new programs are admin only, assuming you use an admin acct and limit what other users can do?

that's how I set it up in the first place. Then I made my wife's account admin, back and forth, uninstall , reinstall, no avail.

Even funnier is that when I killed all "raro" Chrome instances in the task manager and opened then under "wife" account Chrome again, then it asks me for MY password with MY user Id already filled in. So Chrome doesn't seem to get at all that when I change the windows user someone else might be sitting in front of the box. TBH, the Google products become more and more annoying to me.