1.    21 Jun 2017 #1
    Join Date : Aug 2015
    Posts : 109
    Windows 10 Home Premium

    Tm.sys - 0xc0000221 Error

    This tower was upgraded to 10 (from 7) about 18 months ago and has performed admirably, but a few days ago I started getting a load failure message when I booted. It took me to the Troubleshoot screens where I found that Startup Repair could not identify or correct the problem.

    I then went to the command prompt and ran a chkdsk which found no errors. I then ran sfc scannow which found no integrity violations. I then ran both fixboot and fixmbr commands which completed successfully. Rebooting showed that nothing had changed. I then went to the system Reset which retains your personal files but resets Windows. That eventually gave me the following 'The operating system couldn't be loaded because a required file is missing or contains errors'. Underneath that it gave me the file name of tm.sys and the error code of 0xc0000221.

    A forum search on tm.sys returned nothing. That seems weird - nobody else has ever had this error or had a problem with that file?
      My ComputerSystem Spec
  2.    21 Jun 2017 #2
    Join Date : May 2015
    Central IL
    Posts : 4,250
    Mac OS Sierra

    It is a Transaction Manager Driver. Because you upgraded from 7 to 10, you will have to do a repair install. It is suggested to do a clean install for Windows 10 not a upgrade, since any problems carried over from a previous install can cause the new version of Windows to start puking errors.
      My ComputerSystem Spec
  3.    27 Jun 2017 #3
    Join Date : Aug 2015
    Posts : 109
    Windows 10 Home Premium
    Thread Starter

    (For some reason I do not seem to be able to 'Reply with quote' - when I hit the quote button I just get the never-ending circle. It happens on 2 different computers with 2 different browsers and on both Windows 7 and 10)

    Repair install, you say? How does one accomplish that on a W10 computer that won't start?

    Anyhow, I used the 10 DVD and the command prompt to save multiple folders and then reinstalled. The problems created from that will be posted to the Installation and Upgrade subforum(264 Viewing)

      My ComputerSystem Spec


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