# Windows upgrade error 0xC1900101 (driver error, rolled back)

**Code:** `0xC1900101` · **Category:** Windows · **Seen on:** Windows

A Windows feature update failed and rolled back because a driver crashed or was incompatible during installation.

## Meaning

0xC1900101 codes (-0x20004, -0x2000c, -0x20017, -0x30018, -0x3000D, -0x4000D, -0x40017) all point to drivers: storage, graphics, network, antivirus filter drivers or connected USB devices.

## Common causes

- Outdated or incompatible drivers (storage, GPU, Wi-Fi)
- Third-party antivirus
- External devices/docking stations attached
- Not enough disk space

## Quick fix

1. Update drivers and BIOS
2. Uninstall third-party antivirus temporarily
3. Disconnect non-essential USB devices and retry

## Detailed fix by platform

### Windows

1. 

```powershell
# find the failing driver in the setup logs
findstr /i "error" C:\$WINDOWS.~BT\Sources\Panther\setuperr.log
```


## How to diagnose

1. **Logs** — setuperr.log / setupact.log
2. **Drivers** — Device Manager warnings
3. **AV** — Third-party security installed?

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Source: [WhatIsMyError](https://whatismyerror.com/errors/windows/0xc1900101-feature-update-rollback)