I installed visual studio 2010 in my pc. I created a blank solution. When ever I add a project to the solution the original i.e root solution is disappear. This means that as soon as you add a project to a blank solution, the solution disappears and you are unable to add another project. I spent a lot of time to solve the problem. It is very easy.
To do this, goto tools->options->Projects and Solution and check the “Always show solution” option.