Windows 10: Windows Defender won't allow msiexe.exe to make changes.

I'm attempting to install the update to Calibre and I've run into an issue that Windows Defender is blocking msiexe.exe from making changes. then I get an error from the Calibre installer that it was unable to create a temporary file needed for installation.


I'm not sure the two are related. However, this is the first time I've had an issue with msiexe.exe. I checked Windows update and found an update was installed 10/10/2018 and this is the first time I've tried to install something since then, so I'm wondering if there was something in the update that caused msiexe.exe to not be allowed to make system changes. I'm getting errors also that outlook is being blocked from making system changes that I've not had in the past. Again, I don't know if this is related to the last update or not, but I thought I would mention it as it may be related.


My first thought was to just add msiexe.exe to the exception list in Windows Defender, but on second thought what is some malware tries to install something my system would be at risk. But, then again, if I've already ok'd a program to allow software to be installed, should msiexe.exe be blocking system changes. So, I'm asking, should I set Windows Defender to allow msiexe.exe to make changes. Does anyone know of a best practices document for Windows Defender configuration, settings, and allowing programs to make changes.


Thanks,


-cm-

:)

 

Volume Mute Light won´t change color


Macrium is used frequently in this forum. There are experts in using it to recover drives. It's unclear as to why you are struggling to use it. I had not used it and just tried it for the first time and it went smoothly. Maybe these images might help?

 

Windows defender false positive - forced to allow threat


Windows defender has started to identify C:\Windows\System32\mshta.exe as a threat [normally reported as a Trojan Powessere.G]. I use mshta.exe to run an hta custom MsgBox - I have been hoping to keep using my current CustomMsgBox tool [batch file calling a vbs-hta file] until later this year when I hope to have had enough time to replace it with a PowerShell alternative.

Windows defender's notification lets me "allow the threat" but that seems to me to be a bigger security hole than is necessary - it will now ignore a potentially real intrusion when all I want to run is a genuine Windows component. My immediate problem is fixed but I would prefer to fix the false positive using the exclusions list.

I cleared the 'Allowed threats history' so I could use the exclusions list instead. I added C:\Windows\System32\mshta.exe to the file exclusions list and I checked that it had taken properly by checking the exclusions list both in the UI & in the Registry. But the exclusion made no difference, it continued to detect and block the exe.

I have repeated the attempt several times [by clearing the allowed threats list & exclusions list beforehand] and the results are the same every time
- allowing the threat works,
- using the exclusions list has no effect.

I studied the relevant tutorial but have not spotted an error in what I have been doing - Add or Remove Windows Defender Exclusions

Does anybody with experience of using the exclusions list to counter false positives have any suggestions for me?

Denis

 

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Skype Won´t work... games won´t work...

Making backup and re-format...

Maybe I Install a Windows 7 again, At least, all of my games run smoothly ...Sadness!!

*Banghead