Ok, before you jump off the deep end, do some basic clean up.
1. Clean out temp files, recycle bin, etc. Run the Windows disk clean up utility, that's a good start.
2. Defragment the computer. Probably repeatedly.
3. If you're running out of space, delete files you don't need or move stuff to another drive. For a functional drive (not storage only) I prefer to keep it 50%+ free space if I can.
4. Uninstall (properly) old programs you don't need/use anymore.
5. Run anti-virus, etc, multiple types. Getting malware on your computer can slow it way down and you may not know it.
Then run all those things again, repeat a few times and maintain on a regular schedule. You probably let your "house" get dusty and dirty, so it's spring cleaning. Then you have to clean periodically to keep it decent.
However, laptops in general don't have the power to be really fast with video editing. Yes, there are exceptions. They cost a lot more than a desktop.