Grasshopper + Rhino Crash. Please help.

Right, long story short. I recently reset my PC back to factory settings. I installed Rhino 4 - including the most recent update - and then installed the most recent version of Grasshopper. Grasshopper would not run until I installed .NET 2.0 Framwork. I did that and now when I try to run Grasshopper, both Grasshopper and Rhino crash. I am totally stuck here and not sure what is going on. Any input would be great. Thanks