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Because it's newer and hopefully has fewer bugs, I'd like to run chkdsk.exe not from my Windows XP, but from the Windows 7 DVD. While I could simply boot from it, copying it to the hard drive would allow me to use the PC while chkdsk.exe is running.

The more important consideration, however, is that it gives error 50 saying it was unable to write the log file, when it is run from repair mode. So the questions are:

  1. How do I extract chkdsk.exe from the Windows 7 DVD?
    Update: extracted with 7z from install.wim.

  2. Would chkdsk.exe from Windows 7 work well on Windows XP?
    Update: upon running it says it's not a valid win32 app. And it prints "Access is denied." to cmd line.

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Is there a reason you can't just wait for chkdsk to finish before using your computer? If you are ok with that, I'd suggest booting off the Windows 7 DVD and letting it run chkdsk -r on your drive that way to fix any potential errors before booting into XP. – sbtkd85 Aug 12 '11 at 14:21
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I don't think that the chkdsk.exe of Windows 7 is meant to be ran on Windows XP, please note that the architecture of the operating system has changed. Why don't you install Windows 7 virtually and obtain the chkdsk.exe from C:\Windows\System32?

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You mean install it in a virtual machine? My hard drive isn't big enough and my RAM isn't either. – user93200 Aug 12 '11 at 12:15
@user93200: Or extract it from the .cab files of Windows 7 hidden in one of the .wim files for which you need to install special tools, I guess it's much easier for you to run it in a virtual machine and send it to yourself... – Tom Wijsman Aug 12 '11 at 12:17
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