We have a long term care website that keeps giving some windows xp computers the 'theres a problem with this websites certificate' warning after they log in. This is IE8. When I click on the certificate error and then install it, I tell it to put it on the trusted root or the intermediate but it always installs it under 'Other People'. This site works fine on my windows 7 machine and on some xp machines. I have installed the latest update of trusted root certificates from windows update. The time on the machines are correct. I've added the site to the trusted site section and re-installed the certificate but to no avail.
Is there any way I can get rid of this warning? Every pdf file they look at that opens a new window pops this warning up and it's a pain.