I having this error "Session3_initalizatin_failed". When I try ti Install Windows 7. Both Vista Ultimate X64 and XP X32 Work just fine. XP on IDE ATA and Vista on SATA. I have tryed W7 on both disks. Also tryed al of my DDR ram in difrent ways. 1 and 1, and more. total 4 pices of 1 Gb. Also tryed with 2 difrent ati 3870 Graphic card and 1 nVidia card. But no Luck. It lodes files and the mowing bar appers and do 5-6 rounds, then I got the bluescreen and this message: Session3_initalizatin_failed error and ***STOP: 0x0000006F (0XFFFFFFFF0000020, 0X0000000000000000, 0X0000000000000000, 0X0000000000000000) Please Help My spesifikation: MB: asus P5E3 Deluxe CPU: Intel Q6600 Ram: 4Gb PC 10666 at 1333 MHz bus in this case also ryed 1066 MHz bus. GK: 2 ATI 3870 512GB Cross Fire. But in this case only 1 card. HDD: 1: 320GB SATA. 2: 120GB SATA and 1: 120GB IDE ata HDD al are Western Digital. 2 USB HDD 1: 500GB and 1: 1T. the last is SATA. But the these were not connecded at the time of W7 install. Sorry for my bad English. I have looked around this forum and I see that the dvd may be burn at 1X speed. I used 8X on my dvd. If this but if this dont help, what shal I do then? I downloaded the W7 Ultimate 64 on Microsoft.com site. If this fix the problem, then I wil report back with good news. if U gays on the forum has other solutions, please tell. Now it works. I burned the DVD on 4X, the lowest speed on the option.