We received new computers for use in the office (Dell Vostro). They seem to work fine for the most part but when we use IE8 to go to some websites, such as Yahoo! Mail, it tells us:
There is a problem with this websites security certificate
If we have a look at the details it says:
This certificate cannot be verified up to a trusted certification authority
The same websites, however, work correctly in Firefox. I don't understand why the error message appears. Should this not just work?
I don't think it's anything to do with the certificate itself as this is happening on www.yahoo.co.uk and other commercial (Amazon I think?) sites. I think there is something off with the PCs' setup.
The PC has Windows 7 (64 bit) and Norton Internet Security installed.
Any ideas as to why this is happening?