Khamosh-Saya 0 Newbie Poster

i build a new System with Intel DH55TC Motherboard Core i7 2.28 Processor 4GB DDR3 Ram, ATI HD4500 1GB VGA Card

but it performance is very slow like a Pentium 3 System i dont know why its working too much slow
i m using Windows xp Pro sp3.

i installed windows 7. it is much better then Windows xp. but my clint is not ready to take with Windows 7 coz of some software compability.

i tried to change the IDE mode to AHCI but everytime its Dump.

i put Intel 5 series/3400 Chipset AHCI Controller. but it giving me Dump
Right now i installed in IDE mode and its showing Sata driver installed but i cant change into AHCI mode coz i read on google if u will change IDE mode to AHCI it will work Fast
Hyper threading Enable
Virtulization Enable
HPET Enable

Any Solution?