Commented Unassigned: NuGet Package Manager Instatll Error - File contains corrupted data. [27733]

I tried installing this through the NuGet Package Manager and I am getting a "File contains corrupted data" error and through the Package Manager Console:

PM> Install-Package AjaxControlToolkit
Attempting to resolve dependency 'AjaxMin (≥ 4.97.4951.28483)'.
Attempting to resolve dependency 'HtmlAgilityPack (≥ 1.4.6)'.
Install-Package : File contains corrupted data.
At line:1 char:16
+ Install-Package <<<< AjaxControlToolkit
+ CategoryInfo : NotSpecified: (:) [Install-Package], FileFormatException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

Am I doing something wrong or what do I need to do to correct this. I even tried creating a new blank project and installing but still got the same error so I don't think it's my actual VS solution.

Thanks
Comments: I hope I'm not too late to help, but this is what I did and it worked. I use VS2012. Go to Tools > Extensions and Update. Select NuGet Package Manager. I had version 2.0.6 so I uninstalled and reinstalled to v2.8.50313. After restarting VS i went to Project > Manage NuGet Packages. It took longer for the list to load but was finally able to install everything I needed, including the HtmlAgilityPack. Hope this works for you.