You are not alone by the way - a google finds a host of others with similar problems . The common factor is use of ICHxR controller and either AHCI or RAID e.g http://www.hardwareanalysis.com/cont...c/12946/?o=480
Well at least the iastor message has gone. Was it the lastest AHCI sata driver you loaded when you installed XP?. Try running in IDE and see if it goes as an interim measure until the cause is found - it may be driver related. Did you add any additional card to your machine or usb drive about the time this started happening - It would be prudent to get a higher spec PSU e.g 700w -especially as u a running a q6600 and 8800GTX with this MB and the 550w probably hasnt got a future MB life.




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