Window 7 stops during instalation

My computer works properly with windows xp 32 bit. MSI P965NEo V1.1, Intel pentium D 805 2.66mhz L2 2mb, XFX 8800GTS 320MB, HDD SATA WD 250GB JMICRON RAID, ATA PIONEER 111D, 2GB 800mhz Kingston, PSU THERMALTAKE 400w. I tried to install window 7 ultimate 64bit, but problem starts when loading windows files finishes, after that it shows blue instalation desktop but nothing after that JUST BLUE DESKTOP (one with flower, and no coping files and other instalation parts) and nothing else, just stops here. I can move my mose over the screen, its not freezing. What can i do?

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