I'm using ADK 8.1, MDT 2013, x86 Boot image w/ PE 5. Deployed a TS to Windows XP SP3 computer with a single task: Reboot Computer to PE
Getting this: Executing command line: "C:_SMSTaskSequence\WinPE\SMS\bin\i386\bootsect.exe" /NT60 SYS /MBR TSManager 10/31/2013 9:49:27 AM 3000 (0x0BB8)
Failed to install boot image. is not a valid Win32 application. (Error: 800700C1; Source: Windows)
More detailed smsts.log below:
<![LOG[Captured settings for adapter 1]LOG]!><time="09:33:52.197+420" date="10-31-2013" component="OSDNetSettings" context="" type="1" thread="5368" file="netsettings.cpp:99">
<![LOG[OSDNetSettings finished: 0x00000000]LOG]!><time="09:33:52.197+420" date="10-31-2013" component="OSDNetSettings" context="" type="1" thread="5368" file="main.cpp:192">
<![LOG[Process completed with exit code 0]LOG]!><time="09:33:52.307+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="commandline.cpp:1123">
<![LOG[Installing boot image to hard drive]LOG]!><time="09:33:52.353+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="bootimage.cpp:621">
<![LOG[Backing up existing boot system before trying to set up new boot system]LOG]!><time="09:33:52.353+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="bootimage.cpp:644">
<![LOG[BootLoader::backup: C:\, C:\_SMSTaskSequence\backup]LOG]!><time="09:33:53.213+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="bootloader.cpp:85">
<![LOG[BootLoader::restore: C:\_SMSTaskSequence\WinPE, C:\]LOG]!><time="09:33:54.479+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="bootloader.cpp:382">
<![LOG[Saving bcd store to C:\_SMSTaskSequence\WinPE\boot\BCD]LOG]!><time="09:33:57.057+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="bootconfigimplbcd.cpp:703">
<![LOG[Executing command line: "C:\_SMSTaskSequence\WinPE\SMS\bin\i386\bootsect.exe" /NT60 SYS /MBR]LOG]!><time="09:33:57.166+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="commandline.cpp:827">
<![LOG[CreateProcess failed. Code(0x800700C1)]LOG]!><time="09:33:57.182+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="commandline.cpp:1018">
<![LOG[Command line execution failed (800700C1)]LOG]!><time="09:33:57.182+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="commandline.cpp:1245">
<![LOG[Failed to install boot image.
is not a valid Win32 application. (Error: 800700C1; Source: Windows)]LOG]!><time="09:33:57.182+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="bootimage.cpp:681">
<![LOG[Failed to install boot image UCI00073.
is not a valid Win32 application. (Error: 800700C1; Source: Windows)]LOG]!><time="09:33:57.198+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="engine.cxx:840">
<![LOG[Failed to reboot the system. Error 0x(800700c1)]LOG]!><time="09:33:57.198+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="engine.cxx:953">
<![LOG[Failed to initialize a system reboot.
is not a valid Win32 application. (Error: 800700C1; Source: Windows)]LOG]!><time="09:33:57.198+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="engine.cxx:577">
<![LOG[Fatal error is returned in check for reboot request of the action (Restart in Windows PE).
is not a valid Win32 application. (Error: 800700C1; Source: Windows)]LOG]!><time="09:33:57.198+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="engine.cxx:273">
<![LOG[An error (0x800700c1) is encountered in execution of the task sequence]LOG]!><time="09:33:57.198+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="engine.cxx:348">
<![LOG[Set authenticator in transport]LOG]!><time="09:33:57.198+420" date="10-31-2013" component="TSManager" context="" type="0" thread="4856" file="libsmsmessaging.cpp:7734">
<![LOG[Task Sequence Engine failed! Code: 800700C1]LOG]!><time="09:34:45.920+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="tsmanager.cpp:919">
<![LOG[****************************************************************************]LOG]!><time="09:34:45.920+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="tsmanager.cpp:953">
<![LOG[Task sequence execution failed with error code 800700C1]LOG]!><time="09:34:45.920+420" date="10-31-2013" component="TSManager" context="" type="3" thread="4856" file="tsmanager.cpp:954">
<![LOG[Cleaning Up.]LOG]!><time="09:34:45.920+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="tsmanager.cpp:675">
<![LOG[Removing Authenticator]LOG]!><time="09:34:45.920+420" date="10-31-2013" component="TSManager" context="" type="1" thread="4856" file="tsmanager.cpp:686">