请问这是什么问题阿？“Unable to read selector for PCR for processor 0”

论坛不允许发相同的贴？

很久没有windbg了，以前没有问题，前几天用了一下就发现有问题了，如下：
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Connected to Windows XP 2600 x86 compatible target at (Thu Apr  9 00:27:54.609 2009 (GMT+8)), ptr64 FALSE
Symbol search path is: E:\WINDOWS\Symbols;SRV*C:\Symbols*http://msdl.microsoft.com/download/symbols
Executable search path is:
Unable to read selector for PCR for processor 0           <----------------------------------什么错误？
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WARNING: Local kernel debugging requires booting with kernel
debugging support (/debug or bcdedit -debug on) to work optimally.
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Windows XP Kernel Version 2600 (Service Pack 2) UP Free x86 compatible
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 2600.xpsp_sp2_gdr.080814-1233
Machine Name:
Kernel base = 0x804d8000 PsLoadedModuleList = 0x80554420
Debug session time: Thu Apr  9 00:27:55.000 2009 (GMT+8)
System Uptime: 0 days 3:32:58.579
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百度，google了一下，好像是symbols的问题，于是换了sp3的试了也一样，符号文件可以下载，但问题还在。
请问各位知道什么问题吗？谢谢大家