Em.. sorry for my poor english... So here's my problem... I was trying to make AHCI to work (SB600) on my computer ...so then i got into the device manager and replace the driver under "SCSI & RAID Controller"... But some how i can't replace the driver and i can't even remove it! (even if i remove it, windows will reinstall it back again) I tried to remove the file under SYSTEM32\Driver but i can't find the file(dose not exist). so then i try to rename the driver for AHCI to that file(it's file name is "ASM2ORGH.sys") but then it says "File in use" error.(which i don't see the file in explorer).Right... I got fedup with it.. I used UNLOCKER to rename the file on startup...guess what happens.... it renamed itself... can some one PLEASE tell me what the heck is this? And how do i remove it ? (plus. it say's it's a Valid Microsoft file) Some details : Windows XP Pro(Build 2600.xpsp_sp3gdr.090206-1234 : Service Pack 3) Using Avira Anitvir Premium(last updated on 24/8/2009) Foxconn a690vm2ma www .foxconnchannel.com/product/Motherboards/detail_spec.aspx?ID=en-us0000313 Thx in advance.