Please find more information here.
The instructions are for Mac users since the issue of not being able to control a remote iMac is specific to those users. I've never heard of an instance where you couldn't control a remote pc while trying to connect to it from another pc.
You can access the accessibility menu via Security & Privacy within your Mac Preferences.
Please see the screenshot below:
I hope this could help you finding it.
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I'm slightly astonished that nobody seen the solution for windows
I have written it several months ago, check out back in this thread
If mouse clicks doesn't work on the remote computer, ask the remote user to quit TeamViewer and to
boot it as Administrator (right click on TeamViewer executable and select Run as Administrator)
Thanks! This worked for me.