asp.net / ajax

I have .net application saved into my flash drive.
I used Visual Studio 8 to open up the project, and have the following error message.
Any ideas how to fix it?

Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.
Webboy2008Asked:
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colby_arCommented:
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Kyle AbrahamsSenior .Net DeveloperCommented:
Get the latest version of the ajaxcontroltoolkit.

http://ajaxcontroltoolkit.codeplex.com/


Essentially the solution was saved on a different computer with a more recent version.
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Webboy2008Author Commented:
I did download the latest version before typing the question
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Kyle AbrahamsSenior .Net DeveloperCommented:
Ensure that the .dlls are the same version in the solution folders as the one you just installed.
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