Hello, To All Respected Stuff Of MDL Forum and Member. I am Jahir From INDIA New to Windows and PC too. I have HP Laptop Model Number 2000-2128TU 4GB DDR3 RAM HDD 500 Intel i3 2nd Genaration Already I have Installed Windows 7 Enterprise Version x64 But This is in Trail Mood after 3 Days of Invalid Product Key Mood. Please Help me by giving the appropriate Instruction to Activate my Windows License. I will be really thankful to all of you.