This Connection is Untrusted
You have asked Firefox to connect securely to www.google.com, but we can't confirm that your connection is secure.
Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified.
www.google.com uses an invalid security certificate.
The certificate is only valid for the following names:
(Error code: ssl_error_bad_cert_domain)
I had been using this same computer for a few hours previous to this and had been on Gmail during that time with no problems, it just seemed to happen at random when I started Firefox up again. I wasn't on any unordinary sites in the time between when Gmail worked and when it gave me the error message and nothing else out of the ordinary was happening with my computer either. I have never heard of or visited "xing.com" before (apparently it's some sort of German social networking site) and I have no idea why it appeared in the error message. I cleared my cache and everything else and restarted Firefox but was still met with the same warning when attempting to go to Gmail. I googled it and found that this error is sometimes caused by an incorrect system date/time, but I verified that mine is correct so that's not the issue. I then tried to access gmail from my laptop (also using Firefox) and it worked fine and didn't give me any warnings. I did some more searching to try and find out what the cause might be and noticed that the "auto-detected location" that appears in the left-hand side of the google search results was incorrect, displaying "New York City, New York" which is the wrong state and off by about a thousand miles. I tried making a google search with my laptop and there was no location listed there at all.
I don't know a whole lot about this sort of thing, but the incorrect location coupled with the sudden mysterious "Untrusted Connection" error (both of which I've never experienced until now) got me suspicious enough to unplug my routers entirely and then run two full 3.5 hour system scans with two anti-virus programs (Norton 360 and AVG). I plugged my routers back in after about a half hour and tried accessing gmail again and this time did not receive the error anymore. I tried doing a google search and the auto-detected location had gone back to being correct again. About 3 hours later the anti-virus scans finished and neither of them had found anything at all.
Still, I can't help but worry since the untrusted connection/incorrect location issues sound like symptoms of a hijack/hack attempt or some sort of virus or infection and before going to Gmail and getting that error I had just been logged into my online bank account so that makes me even more ill at ease. So do I have reason to worry? Is it safe to log into Gmail and other accounts now? What could the explanations be for why this happened and/or why unplugging my routers fixed it, and what should I be doing about it now?
Other info: I'm not sure how relevant this is, but my OS is Windows XP Professional SP3 and I have two routers; one is a Linksys Wireless-N Broadband Router and the other is a Netopia ADSL+ Gateway. I'm not the one who bought or installed either of these (they belong to my roommate) but they're set up so that my desktop computer (the one with the problem) is using a wired connection and my laptop and my roommate's mac are using a wifi connection.
Thanks in advance for any help or information!