Step by Step guide installing Ubuntu 11.04(Natty) and Windows 7 (Dual booting)

I have installed Windows 7 and Ubuntu 11.04 on HP dx 7200 micro towers. System Information :- Operating System: Windows 7 Ultimate 32-bit (6.1, Build 7201) (7201.winmain_win7ids.090601-1516) Language: English (Regional Setting: English) System Manufacturer:...