Learn how the Telerik controls can be integrated in SharePoint 2007/2010 from this resource. To watch them in action, explore our online SharePoint 2010 demo site.
Thanks Erjan, I re-installed the kit and my site was working again.
I opted for manual install originally, after un-installing the sharepoint solition using powershell there must be some binaries or work that is additionally done in the msi automatic installation package. I downloaded the automatic install, and now thins are working correctly.