What is prx.exe?
prx.exe is part of Microsoft Lsass Security and developed by Microsoft Inc. according to the prx.exe version information.
prx.exe's description is "Critical update"
prx.exe is usually located in the 'c:\' folder.
If you have additional information about the file, please share it with the FreeFixer users by posting a comment at the bottom of this page.
Vendor and version information [?]
The following is the available information on prx.exe:
| Property | Value |
|---|---|
| Product name | Microsoft Lsass Security |
| Company name | Microsoft Inc. |
| File description | Critical update |
| Internal name | Microsoft Lsass Security |
| Original filename | Microsoft Lsass Security |
| Comments | Internal Microsoft Windows update |
| Legal copyright | Copyright (C) 2009 |
| Legal trademark | Microsoft Inc. |
| Private build | Microsoft Lsass Security |
| Product version | 1, 5, 0, 3 |
| File version | 1, 5, 0, 3 |
| Special build | Microsoft Lsass Security |
Here's a screenshot of the file properties when displayed by Windows Explorer:
| Product name | Microsoft Lsass Security |
| Company name | Microsoft Inc. |
| File description | Critical update |
| Internal name | Microsoft Lsass Security |
| Original filename | Microsoft Lsass Security |
| Comments | Internal Microsoft Windows update |
| Legal copyright | Copyright (C) 2009 |
| Legal trademark | Microsoft Inc. |
| Private build | Microsoft Lsass Security |
| Product version | 1, 5, 0, 3 |
| File version | 1, 5, 0, 3 |
| Special build | Microsoft Lsass Security |
Digital signatures [?]
prx.exe is not signed.
Hashes [?]
| Property | Value |
|---|---|
| MD5 | 765c84f7b44b7c57af6fbeb2994e08a0 |
| SHA256 | 4322ce45a9a7cc3e1e9807c97b525759a7d9847c51acecc66e50a6cfe13be1bf |
Error Messages
These are some of the error messages that can appear related to prx.exe:
prx.exe has encountered a problem and needs to close. We are sorry for the inconvenience.
prx.exe - Application Error. The instruction at "0xXXXXXXXX" referenced memory at "0xXXXXXXXX". The memory could not be "read/written". Click on OK to terminate the program.
Critical update has stopped working.
End Program - prx.exe. This program is not responding.
prx.exe is not a valid Win32 application.
prx.exe - Application Error. The application failed to initialize properly (0xXXXXXXXX). Click OK to terminate the application.
What will you do with prx.exe?
To help other users, please let us know what you will do with prx.exe:
What did other users do?
The poll result listed below shows what users chose to do with prx.exe. 86% have voted for removal. Based on votes from 7 users.
NOTE: Please do not use this poll as the only source of input to determine what you will do with prx.exe. Only 7 users has voted so far so it does not offer a high degree of confidence.
Malware or legitimate?
If you feel that you need more information to determine if your should keep this file or remove it, please read this guide.
And now some shameless self promotion ;)
Hi, my name is Roger Karlsson. I've been running this website since 2006. I want to let you know about the FreeFixer program. FreeFixer is a freeware tool that analyzes your system and let you manually identify unwanted programs. Once you've identified some malware files, FreeFixer is pretty good at removing them. You can download FreeFixer here. It runs on Windows 2000/XP/2003/2008/2016/2019/Vista/7/8/8.1/10. Supports both 32- and 64-bit Windows.
If you have questions, feedback on FreeFixer or the freefixer.com website, need help analyzing FreeFixer's scan result or just want to say hello, please contact me. You can find my email address at the contact page.
Comments
Please share with the other users what you think about this file. What does this file do? Is it legitimate or something that your computer is better without? Do you know how it was installed on your system? Did you install it yourself or did it come bundled with some other software? Is it running smoothly or do you get some error message? Any information that will help to document this file is welcome. Thank you for your contributions.
I'm reading all new comments so don't hesitate to post a question about the file. If I don't have the answer perhaps another user can help you.
No comments posted yet.