[Closed] unspecified changes to system configuration (vista)

aswMBR version 0.9.9.1297 Copyright(c) 2011 AVAST Software
Run date: 2012-01-17 11:07:52
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11:07:52.589 OS Version: Windows 6.0.6002 Service Pack 2
11:07:52.589 Number of processors: 2 586 0x605
11:07:52.591 ComputerName: SKULLSCRAPER-PC UserName: Skullscraper
11:07:53.316 Initialize success
11:07:53.463 AVAST engine defs: 12011700
11:08:00.387 Disk 0 (boot) \Device\Harddisk0\DR0 -> \Device\Ide\IdeDeviceP1T0L0-1
11:08:00.391 Disk 0 Vendor: Hitachi_HDS721616PLA380 P22OAB3A Size: 157066MB BusType: 3
11:08:00.407 Disk 0 MBR read successfully
11:08:00.411 Disk 0 MBR scan
11:08:00.422 Disk 0 unknown MBR code
11:08:00.426 Disk 0 Partition 1 00 27 Hidden NTFS WinRE NTFS 9993 MB offset 63
11:08:00.444 Disk 0 Partition 2 80 (A) 06 FAT16 NTFS 147071 MB offset 20467712
11:08:00.454 Disk 0 scanning sectors +321669120
11:08:00.508 Disk 0 scanning C:\Windows\system32\drivers
11:08:12.184 Service scanning
11:08:14.102 Modules scanning
11:08:20.384 Disk 0 trace - called modules:
11:08:20.411 ntkrnlpa.exe CLASSPNP.SYS disk.sys acpi.sys hal.dll ataport.SYS pciide.sys PCIIDEX.SYS atapi.sys
11:08:20.775 1 nt!IofCallDriver -> \Device\Harddisk0\DR0[0x85913a58]
11:08:20.786 3 CLASSPNP.SYS[88dc98b3] -> nt!IofCallDriver -> [0x84e7fa00]
11:08:20.793 5 acpi.sys[8869b6bc] -> nt!IofCallDriver -> \Device\Ide\IdeDeviceP1T0L0-1[0x85800030]
11:08:21.545 AVAST engine scan C:\Windows
11:08:23.893 AVAST engine scan C:\Windows\system32
11:10:06.333 AVAST engine scan C:\Windows\system32\drivers
11:10:15.031 AVAST engine scan C:\Users\Skullscraper
11:11:12.877 Disk 0 MBR has been saved successfully to "C:\Users\Skullscraper\Desktop\MBR.dat "
11:11:12.888 The log file has been saved successfully to "C:\Users\Skullscraper\Desktop\aswMBR.txt "

when my pc starts up or i wake it up from sleep it shuts itself down as if someone pressed the power button, then i have to unplug it about 10+ times in order for it to launch the repair menu, once the repair compeltes it lets me start my pc but it tells me that the repair failed and that the problem was caused by an unspecified changes to system configuration, tryed restoring it to an earlier point (1/10/2012, this problem started on friday 1/13/2012) id like to find the way to fix this please and ty