Error when installing XP after win 7

[abbasi]

Hi all,

My machine was running win 7. For some reason I had to install XP. So inputted the XP CD on the machine and started to installation. While installing, the process formated the C:\ drive and then copied the XP files into C:\ drive. then restarted. After restarting I saw a message saying: *Error loading operating system*.
How to solve this issue to be able to install XP please?

 

[gavinoscur]

Here the step on how you can install XP on Pre- installed win 7.

1. On the Setup of your bios choose the ATA instead of AHCI on the SATA configuration..
2. Then now apply the changes. Then insert your card on the CD ROM.
3. Make sure you have chosen the CD as your first boot device.

 

[abbasi]

Thank you very much for your response.
And don't we need to have changes when we want to install 7 on a pre-installed XP machine?