You need to install these item on your system.
1) Install Window XP Service Pack 2 or Windows Vista
2) Install Visual Studio 2005
3) Install .Net Framework 3.0 ( If Possilble install full redistruable package of X86 (.Net Framework)
4) Download and install Visual Studio 2005 extensions for .NET Framework 3.0 (Windows Workflow Foundation)
5) Download and install Visual Studio 2005 extensions for .NET Framework 3.0 (WCF & WPF).
Now You dont have to uninstall VS 2005.. You will be coding in vs2005 for .net 3.0 applications..
As and when you finish all installation, Open visual studio 2005 -> Open new project -> .NET framework 3.0-> Here,you will get options of WPF & WCF etc