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Author's profile photo S M Firoz Ashraf

How to register/activate ActiveX component MSCOMM32.OCX on Windows 7


This is a follow on document to my previous blog on “Read COMM port using ABAP w/o third party software”. In this blog I will try to explain step-by-step on how to download and activate Windows activeX control MSCOM32.OCX on the client PC where the Weighbridge’s serial port is connected.

Go to the link and download the file mscomm32.ocx


If you are running Windows on 32 bit machine Copy the file that you have downloaded to C:\Windows\System32 folder.

However, if you are running windows on 64 bit machine then copy this file in C:\Windows\SysWOW64 folder


How to activate / re-register MSCOMM32.OCX from an elevated command prompt (Windows XP, Vista, 7, and 8):

  1. Click the Start button.
  2. Type “command” in the search box… DO NOT hit ENTER yet!
  3. While holding CTRL-Shift on your keyboard, hit ENTER.
  4. You will be prompted with a permission dialog box.
  5. Click Yes.
  6. Make sure you have changed the path to C:\Windows\System32 if you are on 32 bit machine /wp-content/uploads/2014/10/32bit_554801.jpg
  7. or C:\Windows\ SysWOW64 if you are on 64 bit machine64 bit.jpg
  8. Type the following command: regsvr32 /u MSCOMM32.OCX.
  9. Hit ENTER. This will UN-REGISTER your file./wp-content/uploads/2014/10/unregister_554804.jpg
  10. Type the following command: regsvr32 /i MSCOMM32.OCX.
  11. Hit ENTER. register with i.jpg
  12. If this gives any error the type the following regsvr32  MSCOMM32.OCX.
  13. Hit ENTER. This will RE-REGISTER your file.register without i.jpg
  14. Close the command prompt window.
  15. Re-start the system. 





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      Author's profile photo Narendra Singh Rathore
      Narendra Singh Rathore

      Hi Firoz ,

      It's really helpful, Could you please all add a procedure for system32



      N S Rathore