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. runtime error 339 mscomm32.ocx : file is missing or invalid.Component “MSCOMCTL.OCX” or one of its dependencies not correctly registered: a file is missing or invalid.Sometimes however, due to conflict with other processes and programs, one might encounter the following error messages: Usually, this file never creates any problem. If any changes are made to this file, it may lead to abnormal system functioning. It is a necessary system file and should not be modified or deleted. Can I Delete or Remove mscomctl.ocx file?
It is also one of the primary shared components used across various MS packages including MS office, and MS SQL server. It controls various modules including Progress Bar tracking, Slider status bar and TreeView controls. It is one of the most important part of Microsoft Active X controls.