I recently purchased the studio 15 laptop which came with windows 7 home premium.I need to run certain applications (very important) that can only be run on windows xp sp2.I have tried a lot of times running the software in compatibility mode but it does not work out.I have finally decided to install xp along with windows 7.I have only 1 partition.I tried to boot with the xp disc but a blue screen comes and shows a fatal error.I contacted dell and they said it is due the the SATA mode selection AHCI and said if i change it into IDE I'll be able to install XP but will lose my ability to boot into windows 7.

Please tell me a detailed procedure to install dual operating system so that i can boot into the one of my choice.