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#1
Unless you put in a folder, included in the environment path variable (e.g. windows, windows\system32 etc), dcomperm is not a system utility.
If you run it via PowerRun, you're either running as NT Authority\System or as TrustedInsraller, in which case type the full path (e.g. C:\users\piero\downloads\dcomperm.exe, if you have it in your Downloads folder)
And besides that, it seems that you're trying to fix DCOM errors.
If so, please take a look in this post.
Why Certain DCOM 10016 Events Don't Matter - Windows 10 Forums