#Troubleshooting

Microsoft Defender turns itself off when another antivirus is installed. Fully remove that program, clear any blocking policy, and switch protection back on.

Windows Error 651 usually means a stalled modem or a corrupt PPPoE profile. Power-cycle the link, rebuild the connection, and reset TCP/IP on Windows 11.

Fix stuttering VLC playback on Android: switch hardware acceleration, lower the video quality, clear the app's cache, update VLC, and tune network caching.