Start the computer and insert the XP installing CD, and when the process gets the partitions management section, delete the partition in which the W7 is installed, create a new one for the XP, and begin formating the XP.
No. Windows XP has it's own kernel and memory management system.
CMD.exe
You can compress your files into a spare harddrive to keep your memory ok
boot.ini
Local
...with Windows XP Professional already installed on your computer. Windows Vista cannot be installed without Windows XP Professional installed first on your computer, it's the same with Windows 7; Windows' latest operating system (OS).
Which task must be completed first for a technician to be able to configure power management states using Windows XP?
Boot from the XP CD use the recovery tool within the disk
Yes. There is a process called Dual Booting, but it requires two hard drives. Just search for "how to dual boot windows vista and windows XP?".
There are many places one can get advice on how to install Windows XP. One can simply call Geek Squad, and they will assist with the installation process. There is also advice on installing Windows XP on sites such as PC World.
Generally, Windows 7 is faster than Windows Vista. This is partly through a process of analysis of code to look for bottlenecks between Vista and 7 and improved memory management of screen Windows in 7.