A week ago, I installed a fresh Windows 7 Home Premium on my laptop-A. After all the Windows Updates, I took a look inside the Trusted Root Certification Authorities, I found some entries appear twice. e.g. there are two Thawte Premium Server CA, and few other entries I known not there.
I check my another laptop-B which had been used for 3 months. the certification entries there are correct.
1 week later, I have a look at laptop-A again, some entries changed and there're still two Thawte Premium Server CA.
I wonder what's going on and how to fix it? does the root certification get updated itself automatically?