What is Runtime Error 339? Runtime errors are very common in the environment in which Windows computing is done.
There are several users who encounter runtime errors at regular basis while working with Windows systems.
Among several runtime errors, the error that frustrates and annoys users a lot is the Runtime Error 339.
This error basically occurs when user make online transactions with the Visa Card.
This error often delivers an error message with it that states - "A file is missing or invalid.
" This error message clearly signifies that the file which is associated with the program is either corrupt or is missing which need to be replaced or reinstalled in order to resolve this error message.
What are the reasons behind runtime error 339? The error code 339 generally occurs when the OCX file is missing from the software application that the computer is trying to install.
This error message does not flash with the installation rather it pops when user attempts to work with the application and uses its functions.
Like many other runtime errors it occurs when a like in the sequence of processes that enables the program to execute is missing, corrupt or has been interrupted by some other processes.
Not only that applications conflicts, virus attacks and sometimes corrupt registries are also capable of causing such problem.
How to fix runtime error 339? As this runtime error is generally caused due to the missing and files, so replacing or reinstalling the missing file will certainly resolve this issue.
Some of the steps that will help user to get rid of runtime 339error as mentioned below.

• Reinstall the missing OCX file - In common, OCX files generate this error when the missing files include msinet.
  ocx, mscomctl.
  ocx and mscomct2.
  ocx.
  These files are available online if user conducts a search for them.
  So, just download these files in the computer and place them at there desired location depending on the application that user is trying to use.
  
• Reinstall the affected program - If this 339 error occurs while using any particular program then it is quite clear that one of the files related to this program has gone damaged or missing, so it is logical to reinstall the program which will automatically renew the damaged and corrupt files fix the issue.
  
• Install the missing application - If the program which is throwing the error uses any certain application which is the cause behind this error then see if it needs any application like Active X or Java to run properly.
  If it requires then just install that application and the problem will automatically fix.
  
• Clean up the windows registry - Windows registry is the central database of Windows system which keeps the track of all the files installed in the PC.
  Due to its vigorous use it becomes dirty several times and as a result error messages occur.
  So, cleaning the windows registry will certainly help user in this situation as it will repair and replace the broken or missing files of Windows registry easily.
  

So, depending upon the error message that user encounter, just follow the steps as mentioned above to resolve and fix error code 339.