On yesterday I formatted my hard drive and ran a clean install of Windows 7 SP1 (64-bit). I installed firefox straight from the Mozilla website, and I get the crash reporter as soon as I open the program. I looked at some troubleshooting methods to see if I could get Firefox to open without crashing, but to no avail. After a few hours I removed Firefox and every "Mozilla" folder on my computer, and I also ran cCleaner to remove the registry entries. I then downloaded and installed the 64-bit version of Firefox (the install from the website installed the 32-bit version by-default). It opened just fine, but now I'm getting the SEC_ERROR_UNKNOWN_ISSUER error on some sites. Not all sites... but sites that I frequent such as google.com. I've searched all over the internet for help and every "fix" that I find does not work. Here's a list of the things that I've done to try to resolve this: - Uninstalled virus protection (TrendMicro), and tried a clean install of Firefox. I don't use Kasperky. - I checked my clock... date and time are correct. - Logged in using the "local admin" account. Gives the same error. - Opened Firefox in Safe Mode. Gives the same error. - I cleared/deleted my cache, and I also checked my proxy settings - Deleted the "cert8" file from my profile folder then restarted FF. Again, I can get to many other sites, but can't get into anything that has to do with Google (Youtube, gmail, adwords, nothing) and a few other sites. I've tried pretty much every solution that I've seen online and nothing fixes this issue. Please help. Thanks, DTV