How to dual boot Windows
XP and Windows 7 (XP installed first)
1. First you need two empty drive
2. After that you need two operating system cd-disk
(windows xp & windows 7).3.
Now get start .4.
Insert cd in cd drive .
8. st boot sevice is cd-rom9.
2nd boot sevice is hard disk drive.10.
3rd boot sevice is removable11.
Press F10 and save it .12.
Now your computer is restarted.13.
Now press any key 
14. Here we’re installing XP Professional on the new
partition. Boot from the XP installation disk and start the install process.
15.
Press enter
o continue.
16. When it comes to choosing a partition, make sure
you select the one you created using the steps above.
17.
Select a
partition and press enter .
18. If
the partition you created was already formatted as NTFS you can leave it, or
you can choose the FAT file system if you want.
20. Basically you continue through as if you were
doing a clean install on any hard drive
21.
Now you have
done your xp is installed after few minutes.
22.
Now restart
your computer and insert windows 7 disk.
23.
Press any
key.
24 And
follow these stapes. 
25. now u are done.
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