I wanted to add some controls to my Toolbox in Visual Studio 2008 SP1 IDE.  I right mouse click on the Toolbox and select Choose Items...   It crashed the system.  I did a goolge search and it suggested removing Power Toys.  I checked and my Power Toys were already removed.

I found another suggestion.  Start Visual Studio in safemode and try to add the controls.  To start in Safemode, get to a Visual 2008 command prompt (Programs->Microsoft Visual Studio 2008->Visual Studio Tools->Visual Studio 2008 Command Prompt).  At the command line enter: devenv /safemode.

While in SafeMode, I added the controls.  They did NOT show up in the toolbox; however, when I restarted VS 2008 "normally," the commands apppeared in the Toolbox.

Here is the link where I found the solution: http://forums.asp.net/p/1222006/2570302.aspx#2570302