My dad’s computer has the Gmail Notifier installed. For some time now, he’s been getting notifications when I get new emails. “Hey, that’s not my account!”
We tried uninstalling it and reinstalling it. Nope, still my email. There’s no option on the program to log out or log in. We use Firefox as our default browser, and nothing we did there had any effect.
The reason why the Gmail notifier logged into the wrong account is that it actually ties in with your Internet Explorer cookies. This is a pretty weird– and bad, in my opinion– way to do it.
Firing up Internet Explorer and clearing its cookies and cache fixed the problem.
Hope this helps someone.

Resources: Gmail notifier checking wrong account; Gmail notifier won’t let me use my own account (Google Groups)
[...] Gmail notifier logged onto the wrong account [...]
I’ve been trying to figure out why its doing this. How retarded. Thanks for the help!
Thanks!! You are a lifesaver. This has been happened to me all week - I can’t live without gmail notifier.
This was driving me insane. Very lucky I stumbled upon your post. thanks a bunch.
Thank you so much for figuring this out! It’s been driving me crazy - after I tried all the things you did, I didn’t know what else to do, but you’re a lifesaver!
Hallelujah! That has been driving me nuts and my wife (a MAC lover) has been rubbing it in: “Just another reason why macs are better than pcs.” Now I can rub it in to her. Thanks for the help!
Dustin
Thank you! I tried clearing my FireFox cookies but I did not think of the IE ones… Why should I - I only use it for Windows Update.
Thanks!
This helped me.
Thank you! Didn’t even think about this. It sure did help me out.
Thank you so much for this, it’s great to get that fixed!
Wow, I’ve spent the last 30 minutes clearing my firefox and safari caches, didnt even think of IE’s lol, thank you so much, that was really frustrating me
Thanks! This was driving me nuts!
Thanks, this helped a lot!
Much appreciated!
Regards
Willem
For those who don’t wish to lose all their cookies,
The specific cookie is here:
%HOMEDRIVE%%HOMEPATH%\Cookies\*@mail.google*.txt
which equates to this on my computer:
C:\Documents and Settings\Jeff\Cookies\jeff@mail.google[2].txt
Thanks for the info!
thanks so much - teasing me for one week..
Thanks!
On my computer the cookies were:
%HOMEDRIVE%%HOMEPATH%\Cookies\russellg@mail[1].txt
and
%HOMEDRIVE%%HOMEPATH%\Cookies\russellg@mail[3].txt
Go to Start / Run and enter this, to see the cookies folder:
%HOMEDRIVE%%HOMEPATH%\Cookies