Problem: When some people run my app the MSI-based installer for some other program will spontaneously start to run and try to reinstall itself.

How can I determine precisely what the reason for the reinstall is?

Maybe there is some shared dependency (a registered COM DLL perhaps) that our app and the other software both refer to..?

I have gotten sample MSI log files from customers (using instructions here) but there are > 20K lines of information which I can't easily interpret.

The root cause problem might originate with my app, or might be with the other vendor, but regardless users shouldn't be faced with this and I'd like to be able to understand & ideally fix this problem.


  • My app is a "legacy" VB6 program.
  • Typically the other installer which runs is an AutoDesk product
  • Log file is named MSI340f4.LOG having 32416 lines
    • It mentions C:\Windows\Installer\4c26ff.msi and roamer.msi (without path)
  • Are you trying to identify which MSI is being ran or how to prevent the MSI from being ran. The solution would be vastly different. – Ramhound Sep 29 '17 at 14:23
  • @Ramhound the goal would be to prevent the problem from occurring. Since the MSI isn't owned by me, I don't really care per se what it is, though I could imagine this might be an important incidental detail, perhaps. – DaveInCaz Sep 29 '17 at 14:40
  • Update your question to indicate which MSI is bring ran. Is something actually being installed or it is just being launched? – Ramhound Sep 29 '17 at 14:42
  • @Ramhound The log files I have list several .MSI filenames. I'm not sure what they are or how they relate. They are from another vendor. It appears that the MSI being run is trying to reinstall / repair itself. – DaveInCaz Sep 29 '17 at 14:52
  • Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer – Ramhound Sep 29 '17 at 14:55

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