I'd like to share with my blog readers my struggling moments and issues i went through few days ago setup the Sitefinity/Telerik controls on my development machine which has Windows 7 Enterprise x64 bit.
If you are trying to install Sitefinity 3.7 SP3 on your box you will get different errors. and if you tried to integrate Telerik controls on your existing Sitefinity you will get more troubles because of dll dependencies between different builds.
The way to install Sitefinity 3.7 SP3 in your windows 7 x64 bit is to do the manual install to Sitefinity, it is easy and straight forward, they provide pdf file on how to do it.
Once you install Sitefinity on your box, if you would like to add your custom pages and develop using Telerik controls, don't try to install another Telerik control package form the site, Use the following dll in your project bin to have telerik controls.
** Steps to have Telerik controls for existing sitefinity project in VS 2010:
1) Open toolbox window.
2) Create a new tab on the toolbox.
4) Right-click under the created tab and click on add items.
5) Navigate to your bin folder.
6) Select Telerik.Web.UI.dll and click ok.
Then, you will have all Telerik ASP.NET controls on your toolbox.
Enjoy Telerik and Sitefinity... :)