> For the complete documentation index, see [llms.txt](https://gunz.gitbook.io/gunz-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gunz.gitbook.io/gunz-guide/getting-started/troubleshooting/antivirus-issues.md).

# Antivirus issues

## <mark style="color:yellow;">If GUNZ won't run due to your antivirus blocking the game from launching, do the following:</mark>

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Let's first check if your antivirus has recently blocked anything from the game that it has falsely flagged as a threat.

* Head to the start menu,  search for "Defender" and select "Windows Security".

<figure><img src="/files/GoOtj1aWm83kAetxuOA4" alt=""><figcaption></figcaption></figure>

* Open "Protection History".<br>

  <figure><img src="/files/avcuepC2Kin7ewcR9g4x" alt=""><figcaption></figcaption></figure>
* If you have a file flagged from the GUNZ folder, choose "allow" from the drop-down menu next to the associated file.<br>

  <figure><img src="/files/rBkOduryc36fyTH8gw74" alt=""><figcaption><p>An example of a flagged file.</p></figcaption></figure>

Try to run the GUNZ launcher. If you still encounter issues, Windows Defender may have deleted some game files. In this case, you will have to uninstall GUNZ and then [re-download ](/gunz-guide/getting-started/download-guide.md)and [re-install](broken://pages/ZFw7FcKsulH4oVJjtpwH)[ it. ](/gunz-guide/getting-started/installation-guide.md)