If you install MDT 2010 on a virtual machine running folder redirection, the setup might stall and never finish...

It looks like this:

The workaround, run the setup with the /passive switch, looks like this

msiexec.exe /i MicrosoftDeploymentToolkit2010_x86.msi /passive

or

msiexec.exe /i MicrosoftDeploymentToolkit2010_x64.msi /passive

/ Johan