theclr20r3error is usuallyoriginated from a .Net Frameworkfunction.
I suggest you to remove first VirtualRouterand then totallyall .Net Frameworkfrom the control panel, then reinstallthemafter a reboot.
You can download .Net Framwerk 4 from here: Microsoft .NET Framework 4 (Standalone Installer)
For other version, just search on Microsoft Download Center
Bye