Please, see the following forum thread which could be helpful: Windows 2000- IE 6.0 - Q2 2009
If you are using .NET 2.0 you need to use Telerik.Web.UI assembly version 2009.x.xxx.20
This dll is in the \Bin folder of your installation. Please use it and correct the version of the assembly in the web.config file.
If you unable to solve the problem, isolate it in a sample working project and send it for examination.
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