Mscomctl ocx a file is missing
Both of them have been discussed in detail below. There are two ways to registering this file under x86 and 圆4 based systems. However, if those were configured by Windows itself, you will have to register them once again. If you have installed this module manually to the application folder, it will not get affected by the updates. The only way to solve this problem is by registering the module once again.
This change would also affect programs and application using the same module to communicate with the Microsoft operating system and other MS products, including MS office 2007 and MS office 2010.
MSCOMCTL OCX A FILE IS MISSING UPDATE
On the official KBÂ reference article 2264258, Microsoft cited it as a major update to fix the vulnerability under mscomm32.ocx in its last Apupdate. Most users report about facing this problem after applying latest critical security updates in Windows 7 (both x86 and 圆4), Windows Vista and Windows XP.
If you have recently encountered this runtime error 339 message, it might be due to the latest changes in the mscomm32.ocx core module by Microsoft to prevent Remote code execution and data theft.