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?

  • 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
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    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
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    Touche good sir :) – Devin Dec 18 '12 at 18:44

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

  • 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
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    Although this works actually trying to identify a particular Hotfix can be painful. As I already knew of this method went with the PowerShell 2.0 solution by @oleschri which worked great. – Lankymart Jul 28 '15 at 11:04
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    Remember that you can search for a specific Hotfix number by using the top-right search bar. – Stevoisiak Jul 13 '17 at 21:00

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 -ID "KB2799904"

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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    Better: Get-HotFix -ID KB2799904. That may even run a bit faster if it translates into a WMI filter rather than filtering after the fact. – Christian Sep 2 '15 at 14:43
  • @Christian I updated the answer. – oleschri Sep 8 '15 at 11:52
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    You don't even need to specify -ID as a parameter, it defaults to it. So get-hotfix kb2799904 – Nacht Feb 25 '16 at 1:30

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
  • How would you know which files to check (if not all of them)? Assume updates A and B both update file F to version X. But only update B contains a critical fix to file G (which is unknown to you) which you are interested in. How would you use this method to make sure file G has the critical fix without knowing what file G is? – Florian Winter May 18 '17 at 6:52

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

Use this WMIC command in an elevated command prompt to get a list of all hotfixes installed. This will not include any updates that were deleted using Disk Cleanup>cleanup system files>windows update cleanup.

wmic qfe

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