Solved! I installed Malwarebytes, ran a scan, and quarantined the 72 'threats' that were found. Restarted the computer, and not only does TeamViewer work now, I've also been able to update other programs (Skype, Acrobat Reader, Chrome) that I hadn't been able to update before.
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TeamViewer 13 is working fine on desktop computer (hard-wired to internet) and Toshiba laptop (wireless), but not on Acer laptop (wireless). TeamViewer used to work on the Acer some six months ago (it's is an elderly neighbor's computer), but then vanished from my list of partners. I didn't think anything of it when it happened, because I figured the woman just wasn't turning her computer on as often. She's brought her laptop over to my house for me to try troubleshooting, but I get the same message on her laptop here that she was getting at her house (Not ready. Please check your connection.) There is no problem with the Acer connecting to the internet. I'm able to browse, download email/attachments, and when there was an older version of TeamViewer installed, TeamViewer itself said there was a newer version, and it went ahead and updated itself to version 13. I tried uninstalling and reinstalling TeamViewer - versions 13, 12, and 8 (I saw version 8 mentioned by someone else who was having this problem, for whom the older version worked). No luck. Firewall on the Acer is set to allow TeamViewer. Antivirus is Panda, but even if I turn it off temporarily, I still get the "check your connection" message. I'm moderately computer-savvy, but I do not know anything about hosts, which I've seen mentioned in other similar threads. Would anyone be able/willing to help me try to resolve this?
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