Fix Windows errors without the guesswork.

Device Manager code 35 means Windows cannot read a device’s firmware or resource data, so Windows may fail to start it or keep dropping it after reboot.

If Windows 10 cannot connect to Wi‑Fi, use a 4-point split: confirm the password, test another device, power-cycle the router, and check for an ISP outage before changing Windows settings.

If every device on the Wi‑Fi is offline, check the router or ISP. If only one Windows PC fails, reset that PC’s network and DNS settings.

Windows not seeing your Wi‑Fi adapter? Use this diagnosis order to check Device Manager, BIOS, drivers, and hardware before you replace parts.

Use rollback for bad updates, a clean reinstall for corruption, or the vendor driver when the adapter is missing.

A Wi-Fi driver missing from Network Adapters usually means the adapter is hidden, disabled, driver-broken, or absent at the hardware level.

Match the symptom to the cause: startup lag points to startup apps, post-update lag points to drivers, and constant disk thrash points to storage or paging.

Windows 11 CPU use above 80% at idle usually points to a runaway process, driver issue, Windows Update, Defender scan, or malware. Start with Task Manager.

Windows 11 has no built-in Guest account, so use a standard local user, kiosk mode, or a child Microsoft account instead.