If you are seeking for some help, then you come to the right spot.
This guide fromMiniToolis specifically written to address this issue.
According to reports from some users, Windows Installer keeps popping up every now and then.
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It even appears when running some diagnostics.
But fret not, this guide will answer you in the following paragraph.
The process showing up means that some software is being installed, changed, or uninstalled.

Here are the fixes.
Solution 1.
Terminate Windows Installer
Step 1.
Right-choose thetaskbarand chooseTask Managerfrom the context menu.
UnderProcess, slide down to find themsiexec.exeprocess > right-choose it > selectEnd taskto terminate the installer process.
After that, see if Windows Installer keeps popping up appears either in the current session or on restart.
Solution 2.
Keep Windows Installer Up-to-date
Solution 3.
Run System File Checker
There is a high chance that your Windows installer is corrupted.
You have to remove it and install it again.
First of all, it’s crucial that you runSystem File Checkerto scan the error.
To do so:
Step 1.
InWindows Search, typecmdto openCommand Promptas an administrator.
In the command window, copy & pastesfc /scannowand pressEnterto run it.
Then wait for it to finish and restart the computer once the screen is completed.
Solution 4.
Heres how to do it.
Go toStart > Update & Security > Windows Security> chooseVirus & threat protection.
Step 2. choose theScan optionslink underCurrent threats> selectFull scan> click onScan nowto initiate the anti-virus scan.
Solution 5.
Take the steps as follows.
In the command window, copy & pastemsiexec /unregisterand hitEnterto cancel the installer.
Then run themsiexec /regserverto register it again.
When accomplishing this action, look to see if Windows Installer keeps popping up still appears.
I hope that this post will be helpful to you.