# Unable to install T3RRA software.

<span dir="ltr" style="font-size: 14pt; font-family: Helvetica, sans-serif; color: rgb(0, 0, 0); font-weight: 400;">**Symptoms**:</span>

<span style="font-family: Helvetica,sans-serif;"><span style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">“Access denied” type errors occur when attempting to install T3RRA software. The installation fails, or the software disappears from the computer shortly after installation.</span></span>

![](https://docs.t3rra.com/uploads/images/gallery/2025-03/scaled-1680-/vpr56jwaofrp7j6eh-cunckdoumdpfdasw-png.png)

<span style="font-family: Helvetica,sans-serif;"><span style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 400;">**Causes**:</span></span>

1. <span style="font-family: Helvetica,sans-serif;"><span style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">Antivirus software on the tablet prevents installation, or quarantines the installed files shortly after installation.</span></span>
2. <span style="font-family: Helvetica,sans-serif;"><span style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">Company IT staff have locked down the tablet such that software cannot be installed.</span></span>

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<span style="font-family: Helvetica,sans-serif;"><span style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 400;">**Solutions**:</span></span>

1. <span style="font-family: Helvetica,sans-serif;"><span style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">Disable your antivirus software or ‘whitelist’ T3RRA files with an exclusion. Consult your antivirus software documentation for information on how to do this. In some situations you may have to uninstall the antivirus software. It can normally be reinstalled afterwards.</span></span>
2. <span dir="ltr" style="font-size: 14pt; font-family: Helvetica, sans-serif; color: rgb(0, 0, 0); font-weight: 300;">Consult your company IT staff.</span>