当我高兴地更新软件包时，出现了以下错误：
Error: Windows API error 87: The parameter is incorrect.
包含此错误的完整更新报告如下：
MiKTeX Update Wizard Report
Version: 2.8.3553
Date: Friday, May 13, 2011
Time: 20:22:14
downloading http://ctan.unsw.edu.au/systems/win32/miktex/tm/packages/miktex-zzdb2-2.8.tar.lzma...
538036 bytes, 1199.60 KB/Sec
updating package definition directory ("C:\Program Files\MiKTeX 2.8\tpm\packages")...
installed 602 package definition files
visiting repository http://ctan.unsw.edu.au/systems/win32/miktex/tm/packages/...
repository type: remote package repository
loading lightweight database...
downloading http://ctan.unsw.edu.au/systems/win32/miktex/tm/packages/miktex-zzdb1-2.8.tar.lzma...
106964 bytes, 392.70 KB/Sec
starting package maintenance...
installation directory: "C:\Program Files\MiKTeX 2.8"
package repository: http://ctan.unsw.edu.au/systems/win32/miktex/tm/packages/
lightweight database digest: eb1794ec380d1dad82ca309893aaa958
going to download 29222566 bytes
going to install 1046 file(s) (60 package(s))
unregistering C:\Program Files\MiKTeX 2.8\miktex\bin\MiKTeX208-core-PS.dll
unregistering C:\Program Files\MiKTeX 2.8\miktex\bin\MiKTeX208-core.dll
unregistering C:\Program Files\MiKTeX 2.8\miktex\bin\MiKTeX208-packagemanager-PS.dll
unregistering C:\Program Files\MiKTeX 2.8\miktex\bin\MiKTeX208-packagemanager.dll
downloading http://ctan.unsw.edu.au/systems/win32/miktex/tm/packages/expl3.tar.lzma...
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downloading http://ctan.unsw.edu.au/systems/win32/miktex/tm/packages/miktex-bibtex-bin-2.8.tar.lzma...
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downloading http://ctan.unsw.edu.au/systems/win32/miktex/tm/packages/miktex-bin-2.8.tar.lzma...
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Error: Windows API error 87: The parameter is incorrect.
发生了什么事？我该如何解决？谢谢。
答案1
该问题曾被报告给miktex-users邮件列表（Nabble 存档：
http://old.nabble.com/Problem-Updating-%28Windows-API-error-87%29-td24971196.html）
最终的解决方案是：
问题出在我打开了一个 MikTex 实例，它阻止了安装所需的文件。我关闭 MikTex 实例后，安装工作正常。
通常，关闭 Windows 下的所有更新应用程序是个好主意。如果失败，请重新启动计算机并重试。
答案2
我遇到了同样的问题 - 上述解决方案对我来说不起作用，但可以在以下位置找到有效的方法http://comments.gmane.org/gmane.editors.lyx.general/69152.解决方法是：
问题解决了。PDFLatex 不会因为卸载软件包而导致运行出现问题而死机。它阻止了一些文件，我猜这些文件需要由软件包管理器进行修改。关闭 PDFLatex 后，安装运行顺利。
希望能帮助到你！
答案3
我发现，对于 MikTeX 中的任何“Windows API 错误 87”，删除以下文件夹中的所有文件都有效。
C:\Users\%USER%\AppData\Local\MiKTeX\2.9\miktex\data\le
C:\ProgramData\MiKTeX\2.9\miktex\data\le
答案4
我遇到了同样的问题，然后我尝试重新安装 MiKTeX。另一个问题是，由于“API 错误 87”，无法安装...
这是因为另一个程序正在使用该文件，就我而言是 Adobe Cloud Creative。
如果您关闭使用此 dll 的程序，那么您可以实现、安装或使用它...
另一个选项是寻找文件，如果没有出现在正确的位置，则使用acrobat的文件，是一样的。
粘贴到安装 MiKTeX 的根目录，通常是：c:program files/miktex2.9/miktex/bin/x64