At University we have VS 2005 and it has some refactoring tool like rename, extract method, extract class, etc.
I have decide to download VS 2008 from MSDN and it has only Rename and Extract method, how can I activate the other?
EDIT: I have downloaded Microsoft VS 2008 C# Express Edition.
Have you downloaded the Express Edition? The Express Edition does not have all Refactoring. At University you might have version other than Express.
Update:
Since you posted that you have the Express Edition : You cannot have those refactoring tool from Visual Studio that you had at school. The Express Edition limit your functionnalities. See this chart: Here. Go check at your school to download an Academic version (usually offer to University). This way you can get the full version with all refactoring tool.