Now since you know what your certificate store is, I'm sure that you've had a couple of sleepless nights over it.
Here's how to get back to those restful nights.
Or you might not close your eyes until you've reformatted and reinstalled Windows.
Go to Microsoft's Sigcheck page and download sigcheck.zip.
Extract sigcheck.exe somewhere convenient like your desktop.
Run the command prompt. Navigate to where you saved sigcheck.exe. Run "sigcheck -tv".
It'll take a couple of minutes.
The results will determine how (or whether) you sleep tonight.
Note: This doesn't check Firefox's certificate store.