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I recently fixed a defect in our product by applying Microsoft hotfix. Some of our customers are still reporting that the issue remains with the hotfix applied. They are using pretty tightly controlled laptops and can't just apply the hotfix themselves. I want to know if there is some way I can check if a hotfix has been applied.

This article and this thread suggest that a hotfix applied with the hfx.exe program will appear in the registry under:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Hotfix\KB nnnn.

However, I see no "Hotfix" key under CurrentVersion (also, I didn't apply the hotfix with hfx.exe, I just ran the file I downloaded from Microsoft and it did the trick). Is there another way to determine if it has been applied?

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What version of Windows are the laptop's running? –  David Dec 18 '12 at 18:40
Windows 7 Enterprise –  Devin Dec 18 '12 at 18:42
That article suggesting to look in the registry is for Windows NT 4.0, and that's it. I'm assuming you aren't running NT 4.0. ;) –  Ƭᴇcʜιᴇ007 Dec 18 '12 at 18:43
Touche good sir :) –  Devin Dec 18 '12 at 18:44

4 Answers 4

up vote 6 down vote accepted

You can see what updates have been installed on a computer by going to Add/Remove Programs and then clicking View installed updates. The search box comes in very handy here.

Updates Updates

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Yeah, I just realized that myself. I didn't think hotfixes would be in there, but I was wrong. –  Devin Dec 18 '12 at 21:10

The hotfix's KB article should show file information for what it is updating. They provide version numbers, file sizes and expected time-stamps. If your files match those (or are newer) then you've got the fix (or a newer one that incorporates the older one) applied.

For example (from KB923293):

enter image description here

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This is pretty much the only way I know how to do this. keep in mind the file versions and file dates could be changed in the future so keep that in mind. –  Ramhound Dec 18 '12 at 18:44

You can use PowerShell 2.0 or greater to detect which hotfixes are installed.

PS> Get-HotFix

To detect whether a specific hotfix (e.g. KB2799904) is installed, write:

PS> Get-HotFix | where { $_.HotFixID -eq "KB2799904" }

If this returns at least one object, the hotfix is installed.

You can also specify a remote computer with the -ComputerName parameter if you have sufficient permissions on that computer.

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As a more generic (or scriptable) way to do this, you could employ systeminfo which does print a section with a list of hotfixes installed:

C:\Users\user> systeminfo
Hotfix(s):                 88 Hotfix(s) Installed.
                           [01]: KB2032276
                           [02]: KB2296011
                           [03]: KB2305420
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