  װ֪
  ĲϵͳΪWin7ԷʹñĲϵͳΪXPδװNet4ҪװNet4ʹdotNetFx40_Full_setup.exeаװҲԵ΢ٷվذװNet4Net4صַΪ
  http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992
