1.-first find cmd shell icon on START>ALL PROGRAMS>ACCESORIES (Optional you can search CMD on your vista and you fin the icon)
2.- Right click on it and select RUN AS ADMINISTRATOR
3.-Go to C: (you can type cd (enter) your prompt look like this C:>)
4.-type "SQLServer2005_SSMSEE.msi" (Enter) and the installer runs like if you have made doble click on it)