# UEFN NOT STARTING UP 

**URL:** <https://forums.unrealengine.com/t/uefn-not-starting-up/2463091>\
**Category:** Issues and Bug Reporting\
**Tags:** launch, launcher, crash-on-launch, launcher-issue, launcher-error, launcher-crash, launch-failed, unreal-editor-for-fortnite, crash, UEFN, bug-report, editor, fortnite\
**Created:** [April 18, 2025, 1:38pm UTC](https://forums.unrealengine.com/t/uefn-not-starting-up/2463091 "2025-04-18T13:38:43Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [April 18, 2025, 5:06pm UTC](https://forums.unrealengine.com/t/uefn-not-starting-up/2463091/5 "2025-04-18T17:06:16Z")

</div>

hi @lalchatni  
There are a couple of things to try.

Look at this post on Windows Defender and see if Anti Virus is affected similarly.

[urc.exe and UE Fortnite binary get wrongly flagged as Malware from Microsoft Defender](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/2)

Next you need to check that the installation is working  
[Verify UEFN/Fortniite](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5)

These must be “Run as Adminstrator”.  
If you are using Epic Games Luncher you must start as “Run as Adminstrator”.

Check that your Project path is NOT on OneDrive, but on a local drive

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