IE Errors on secure sites

I have a client with 1 Xp Media Center and 4 XP Home computers. All are same service pack and update level. All are running IE7. The problem is on two different secure sites they go to for their business. Both sites work fine on the Media Center computer and not on any of the Home Editions. One site generates script errors even though IE is set to ignore errors. The other site when attempting to search in a pop-up window reverts back to the login screen. I have combed through and matched all the security settings with no change. Uninstalled IE7 and went back to IE 6 with no change. Newest versions of Java- no change. Both sites use .asp if that helps.
Please help resolve these seemingly related issues.
Thank you in advance.
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war1Connect With a Mentor Commented:

So the problem occurs on IE6 as well as IE7.  

Troubleshoot Secure Web Sites in Windows XP;en-us;813444
Aland CoonsSystems EngineerCommented:
Have you contacted the vendor operating those sites? They often have insight into the operation of their own websites.

Secondly, try running a spyware sweep with a legitimate sweep tool. (I like Ewido and WebRoot.)

Finally a question -- Did all this stop working at a certain date?  Like when the IE7 update was installed or a patch installed last Tuesday?  Have you tried rolling any of the systems back to an ancient restore point?
jhawley24Author Commented:
Thanks for the quick response. One of the two vendors have been onsite and could not figure it out.
 I was hoping to avoid rolling back if possible but will try it if nothing else will fix it.
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Have you already tried adding the site to the "Trusted Sites"?

So in IE6:
Internet Options...
Click on green: Trusted Sites
Click on: Sites...
If the site is not secure, untick the box: Require server verification...
Type the address, for example and click on: Add
Click on: OK and OK
Restart IE and try the site

jhawley24Author Commented:
 Yes I did add them to trusted sites.

 Yes it is with either version- with the understanding that IE6 is after uninstalling the auto installation ( I hate that) of IE7. Who knows how many components are updated and not rolled back?
I am looking at the links you sent but won't be able to try anything till early next week.

All components are rolled back with uninstalling IE7.  Some IE7 bookmarks may be left in Favorites menu.

Let us know how the links work.
jhawley24Author Commented:
Sorry for the long delay. Re-register of dll's and creating new profile seems to be the ticket.
Thank you for the help.
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