Please remember that the V tablet is currently limited to a maximum 512GB of storage, and while this may seem like a lot, it is still significantly less than most laptops and desktops. Finding a laptop with a full 1TB (1024GB) of storage should satisfy most storage needs. The V might be getting an option for this in the future, but as far as I know there are currently no guarantees.
You say that your computer is slow, occasionally won’t boot, and there’s no room for “videos and other things”.
Based on what you’ve said, it sounds your hard drive is completely full and needs to be emptied. You can offload some of your extra files to external hard drives or the cloud, where they’ll be safe and accessible until you get a device with more storage.
Hopefully this helps!
EDIT: If you are saving a lot of videos and movies to your device, you definitely want more storage.