How to Fix - A handful of websites report that Internet Explorer 6 is not longer compatible, but I'm already using Internet Explorer 8?

A handful of websites report that Internet Explorer 6 is not longer compatible, but I'm already using Internet Explorer 8

Original title:  A handful of websites won't come up and display a generic message: "We're sorry, but ****.com is no longer compatible with Internet Explorer 6.0 and below.
 Please upgrade to Internet Explorer 8." I'm running IE 8 already.
I've verified that I'm using the latest version of IE 8. I've reset IE to default settings, deleted the temporary and history folders, and even tried running IE 'without add-ons' but I still get this error message when trying to view a handful of sites. 
Two of the sites are:
https://ecentral.ident.com/
www.golftec.com
Any advice on what I should try next so that I can view these few problematic websites?
Thanks.

Anwsers to the Problem A handful of websites report that Internet Explorer 6 is not longer compatible, but I'm already using Internet Explorer 8

Download Error Fixer (Free)

Open IE8 (only!) to this page:
http://www.fiddlertool.com/ua.aspx.
Highlight/select ONLY the red text at the top of the page and copy it to your clipboard.
 (Also scroll down to see if an issue has been detected and a possible resolution offered.) Open a reply to this post &
paste the contents of your clipboard into your reply.

~Robear Dyer (PA Bear) ~ MS MVP (IE, Mail, Security, Windows & Update Services) since 2002 ~ Disclaimer: MS MVPs neither represent nor work for Microsoft

To check for Windows updates. Open Windows Update by clicking the Start button , clicking All Programs, and then clicking Windows Update. In the left pane, click Check for updates, and then wait while Windows looks for the latest updates for your computer. If any updates are found, click Install updates.

Install the latest updates for Windows and for the program displaying the error. Note that the update for the program might be listed as an optional update on the Windows Update page.

Open Windows Update by clicking the Start button Picture of the Start button. In the search box, type Update, and then, in the list of results, click Windows Update.

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