How do i switch win 7 to win xp

[Shouzab]

I installed win xp on d drive and win 7 on c Drive same HD but does not appear os choice windows.Only win 7 open.

 

[phil22]

If you installed XP in the correct manner, you should get a dual boot menu everytime you start your PC so you can choose which one you want to use.

You evidently did something wrong when you installed XP.

See this: http://www.howtogeek.com/howto/8790/dual-boot-your-pre-installed-windows-7-computer-with-xp/