Visual Studio 2010 crashing for no reason

Having some issues with upgrading older project. They upgrade fine and the report generated says everything went well. I make warning and error changes and recompile and Visual Studio 2010 just hangs while building. I have let it run overnight for the heck of it and still no errors or anything, so for now, back to Visual Studio 2008 for older projects. this project was writtern in .Net 1.1