AJAX not working after re-install

Good afternoon,
Ive recently had to re-install my laptop, and Visual Studio 2010, I re-installed AJAX, but now when I run my project in debug mode I get the attached error and cannot proceed.

I have re-installed the ajax, and in my project properties I have removed the AJAX dll reference and tried to re-add, but same issue.

The first time I did run it, it came up with an error asking for a .cs file, I clicked cancel as didnt understand what it was asking for, now it will not ask me for the CS file again, and I cant get past the error.

Any ideas how I can recover from this error?

Thank you

System.Resources.MissingManifestResourceException was unhandled by user code
  Message=Could not find any resources appropriate for the specified culture or the neutral culture.  Make sure "AjaxControlToolkit.Properties.Resources.resources" was correctly embedded or linked into assembly "AjaxControlToolkit" at compile time, or that all the satellite assemblies required are loadable and fully signed.
  Source=mscorlib
  StackTrace:
       at System.Resources.ManifestBasedResourceGroveler.HandleResourceStreamMissing(String fileName)
       at System.Resources.ManifestBasedResourceGroveler.GrovelForResourceSet(CultureInfo culture, Dictionary`2 localResourceSets, Boolean tryParents, Boolean createIfNotExists, StackCrawlMark& stackMark)
       at System.Resources.ResourceManager.InternalGetResourceSet(CultureInfo requestedCulture, Boolean createIfNotExists, Boolean tryParents, StackCrawlMark& stackMark)
       at System.Resources.ResourceManager.InternalGetResourceSet(CultureInfo culture, Boolean createIfNotExists, Boolean tryParents)
       at System.Resources.ResourceManager.GetString(String name, CultureInfo culture)
       at AjaxControlToolkit.Properties.Resources.get_E_NoScriptManager() in d:\hg\act\Server\AjaxControlToolkit\Properties\Resources.Designer.cs:line 68
       at AjaxControlToolkit.ScriptObjectBuilder.RegisterCssReferences(Control control) in d:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ScriptObjectBuilder.cs:line 334
       at AjaxControlToolkit.ExtenderControlBase.OnLoad(EventArgs e) in d:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:line 305
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  InnerException:

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