can not install windows xp after windows 7

[kasif_snk]

Asalam o Alekam

i have a problem main ne apnay desktop pc main windows 7 install ki hai ab obara xp install karna chata hon lekan plz wait installing windows par aa kay Blue screen aa jati hai jo eror deti hai keh plz chek your newly installed driver or run a virous scan disk jab keh agar dobara windows 7 ko karoo to ho jati hai windows 8 b ho jati hai main ne cd se dvd se usb se har tarah try ki hai xp nai install ho rahi bios main ja kar sata configuration ko b AHCI st ATA par kia hai lekan same problem aa rahi hai agar kisi ko pata ho to plz is ka hall batayee detail kay saath tnx in advance

pc specification.....

Dell optiplex 960
2.8 core 2 due
4gb ram
500 gb hard drive
z help if any one knows about this problem .....

[kasif_snk]

weher are the experts plz help

[kasif_snk]

Wah g kaya expert hain yahan par masla bataye hue one week ho gaya abi tak kisi ka ik reply nai mila

[khalliqie]

click me click me click me

[kasif_snk]

awarapan bahi main ne Ata par bios ko set kar kay chek kia hai plz agar koi aur mehtod ho jis se yeh masla hal ho jayee to bata dain

[sonamunda]

Windows 7 aur 8 100MB adistional space use karti hai ap us 100mb ki partion ko delete karo aur phir C:/ mai windows karo aur han sata opration ko xp wale mathod pe rakhna jis pe pehle win xp chalti rahi hai ahci ya ata