Hello David Romanchuk,
That is a strange behavior. We have never experienced such a crash. It looks like .Net 3.5 framework problem. I made small research at google and found that this behavior can be caused by some VS add-ons like Gallio. So if you have some add-ons you can try if one of them is not causing the crash. Another thing i found as a workaround in a forum is to make new solution and add the projects there. More info you can find in this thread- http://stackoverflow.com/questions/700511/vs2008-crashes-with-fatal-execution-engine-error.
However the things I can't guarantee that the things I suggest will work as I can't reproduce the crash so I have not tried them myself.
Hope that helps. If the problem persist please let me know.
the Telerik team