Yes, Definitely you can update your windows. Before any update you can save your data in external drive or cloud or one drive.

Another possibility is outdated software or drivers, which can cause compatibility issues and decrease your computer’s speed. Malware or viruses can also significantly slow down your system as they consume memory and CPU usage. A full hard drive or insufficient RAM could also be a possible culpri

The amount of RAM needed depends on how you use your computer. For basic tasks like web browsing and document editing, 4GB to 8GB is usually sufficient. However, for more demanding tasks like gaming, video editing, or running multiple applications simultaneously, 16GB or more is recommended. 

To speed up a slow laptop, focus on freeing up resources, optimizing performance, and potentially upgrading hardware. This can be achieved by uninstalling unused programs, managing startup applications, freeing up disk space, updating software and drivers, and considering hardware upgrades like an SSD or more RAM.