no id or password without reinstall

[ajb5440]

I have to instruct my sister in Chicago (on COMCAST) every time she needs me to connect.  I instruct her on unstalling, then running the setup program again.  Teamviewer runs again with the same ID.  This may work for several days until "no ID or password" again.  Then I have to tell her how to uninstall and reinstall to get connected.  This has been going on for at least 1 year.  It also happens to a brother in Palm Bay Florida, although I only help him about once every 2 months.  Any suggestions?  All computers are win 7.  Both are on COMCAST.

[matt]

Who gets the error?
You or your sibling?

What is the exact error?
I've not seen anything similar to what you wrote...