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I use MiKTeX 2.9 along with LyX in Windows 7.

Last week I downloaded and updated LyX and it worked fine. After that I tried to update MiKTeX, but it failed or was not properly completed.

Since then LyX can't compile documents in PDF. Specifically, when I try to compile a document, after several minutes LyX generates a message that reads

The command pdflatex 'document name' has not yet completed. Do you want to stop it?

Two options are offered, "Stop it" and "Let it run".

When I choose "Let it run", exactly the same message is generated after a while.

When I choose "Stop it", it generates the following message:

File does not exist: C:\Users\choix129\AppData\Local\Temp\lyx_tmpbuf0\file name.pdf

So I thought I'd rather uninstall the MiKTeX from the computer and reinstall it completely. Then I went to the control panel and chose MiKTeX 2.9. Then I encounter a message:

Windows API error 2: The system cannot find the file specified.

Once I click "OK", then I find a message suggesting

This program might not have uninstalled correctly. If this program didn't uninstall correctly, try uninstalling using settings that are compatible with this version of Windows.

So I click the option "Uninstall using recommended setting" but then it doesn't generate any more feedback.

So I find myself badly stuck. Could any of you please help me out? Any comments would be greatly appreciated.

Thank you in advance.

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    Can you launch MiKTeX Options? If so, try Refresh FNDB and update formats (close LyX first, just in case). – Bernard Aug 18 '14 at 17:57
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    Welcome to TeX.SX! I'm not sure how LyX passes filename information to pdflatex, but if you do, in fact, have a space(s) in your file name, that might cause a problem. Refer to Naming LaTeX files: best practice? for more details. – Paul Gessler Aug 18 '14 at 18:10
  • Bernard, your suggestion works! Now all the problems seem to have been solved and LyX and MikTeX compile documents without any problem. Thanks a lot. I greatly appreciate your help! – Lachesis Aug 18 '14 at 18:17
  • Paul, your suggestion sounds helpful to me. I think I should refer to "Naming the LaTeX files" material you recommend. Thank you. – Lachesis Aug 18 '14 at 18:20
  • Thank you Martin for beautifully editing my question. I wonder where I can find information on how to format questions properly. – Lachesis Aug 18 '14 at 18:21

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