Windows 7: windows\system32\kdcom.dll  is missing or corrupt

Posted on 2011-09-30
Last Modified: 2012-05-12
I am working on a windows 7 laptop which fails to boot due to:

File: \windows\system32\kdcom.dll   Status: 0xc0000221   Info: Windows failed to load because the kernel debugger DLL is missing or corrupt

Startup repair also fails, it detects the corrupt file but fails to repair it.
I have tried using SFC, a restore point, as well as booting off a linux disc and replacing kdcom.dll with a copy from another system that doesn't have problems.

Any ideas aside from reformatting/reinstalling windows at this point?

Thank You.
Question by:jspaziano
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LVL 30

Expert Comment

ID: 36891101
try virus live cdrom


 i bet its a virus and using a live cdrom out of windows will help

Author Comment

ID: 36891121

i did use the AVG bootable disc as well, viruses galore which were all removed but still can't fix the file that windows says is corrupted even though i know i'm replacing it with a file that's not corrupted
LVL 30

Expert Comment

ID: 36891186
did you update your live cd before scanning

you may be forced to do a fresh install sorry if thats going to cause you problems
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Expert Comment

ID: 36891263
You can try booting to your windows 7 cd and choose to install windows. Then when prompted select upgrade. This will reinstall while preserving user data and programs.

Author Comment

ID: 36891538
thanks, i will give the upgrade a shot.

the live cd was updated and found a bunch of infections which were deleted.

Accepted Solution

jspaziano earned 0 total points
ID: 36893006
You can't do an in-place upgrade to do a repair install of windows  unless windows is in a bootable state (that's brilliant of Microsoft since a startup repair doesn't always fix the issue)

i wound up just reformatting/reinstalling

Author Closing Comment

ID: 36915503
had to reformat the system, all repair attempts failed to resolve the problem

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