I dont have any experience with win 8, but the flash of the update installer sounds like ubisofts auto-update program (gu.exe). Check your SHIV shortcut is linking to the actual game .exe and not the updater.
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E8500 @ 3.8ghz, DFI BloodIron P45 Elite T2S, Corsair VX550W, 4gb 800mhz Xms2, MSI 6850 OC @ 950/1150 1.148v, Seagate 7200 250gb
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