How can I factory-reset my Lenovo laptop without losing Windows activation?

A clean install may help, but overheating while playing YouTube suggests a hardware or cooling problem too. Check whether the vents are blocked, make sure the fans are spinning, and gently clear dust from the vents with compressed air. If temperatures remain high, the laptop may need internal cleaning or fresh thermal paste. Heat can make the processor throttle, which causes the lag you’re noticing.

The laptop may also be slowed down by unnecessary startup programs or background software. You could first try Windows’ built-in reset option and select the choice to remove everything, or create official Windows installation media for a completely clean setup. If it still overheats and performs poorly afterward, the problem probably isn’t Windows alone.

Before reinstalling, check whether your current Windows installation is activated and note whether it’s Home or Pro. You can also use a reputable key-information utility to record the license details, but normally you won’t need them for a reinstall on the same laptop. Back up your files first because a clean installation will erase the drive.

You should be able to reinstall Windows 11 without entering a product key. The laptop’s activation is usually stored as a digital license linked to its hardware, and many Lenovo systems also have an OEM key stored in the firmware. When the installer asks for a key, choose “I don’t have a product key,” install the same edition of Windows, and it should reactivate automatically after connecting to the internet.