I have a Dell M4400 with updated bios (A18 with Slic 2.1). I have a copy of a Dell OEM Windows 7 Home Premium 64-bit (5.47gb on a dual layer dvd). I also have a copy of Windows 7 Ultimate 32-bit Retail (clean copy). I prefer to go the 32-bit method just for compatability and simplicity and I only have 2gb of RAM. If I go the 32-bit method what is most reliable way to activate? Is a bios mod required in this situation? Is activator as reliable? If I go the 64-bit method, how is the best way to take the Dell OEM Win 7 Home Premium dvd and modify to (remove ei.cfg file?) as to be able to install Ultimate version? If I need to extract and make an ISO, what is best software? I have Nero 7 updated and ImgBurn (free version). I want to thank anyone and everyone ahead of time for your help. If there is any information that I can furnish from the Dell OEM Windows 7 Home Premium 64-bit DVD, please let me know.