I need some help in troubleshooting my problem - please!

I recently loaded 1.60 into a site, and went through the setup steps, and everything seem to go fine, until I got to the point of "go to site" ... and I received the following error.



Server Error in '/' Application.
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Common Language Runtime detected an invalid program.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidProgramException: Common Language Runtime detected an invalid program.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace:


[InvalidProgramException: Common Language Runtime detected an invalid program.]
   NopSolutions.NopCommerce.BusinessLogic.Content.NewsManagement.NewsManager.get_NewsEnabled() in F:\Temp\Test\nopCommerce 1.60\Libraries\Nop.BusinessLogic\Content\News\NewsManager.cs:479
   NopSolutions.NopCommerce.Web.Default.BindData() in F:\Temp\Test\nopCommerce 1.60\NopCommerceStore\Default.aspx.cs:53
   NopSolutions.NopCommerce.Web.Default.Page_Load(Object sender, EventArgs e) in F:\Temp\Test\nopCommerce 1.60\NopCommerceStore\Default.aspx.cs:45
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   NopSolutions.NopCommerce.Web.BaseNopPage.OnLoad(EventArgs e) in F:\Temp\Test\nopCommerce 1.60\NopCommerceStore\Controls\BaseNopPage.cs:80
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627




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Any thoughts please?