Reinstalling is the last step, not the first. Work through how to fix mouse scroll wheel in the order given and the reinstall almost never becomes necessary.
Anything marked optional really is optional, so skip it without guilt. Most advice on this topic assumes you already know half the answer, which is exactly the problem. If it broke right after an update, the update is the suspect until proven otherwise.
The short answer
Verify the files, restart fully, and only then start changing settings — reversing that order is what turns ten minutes into an evening.
Fixes that require more patience
Start with the simplest option before touching anything that is hard to reverse. Small details matter more than they should here, so read the order of steps carefully. If you are short on time, the first section alone is usually enough. Overlays from other applications cause more of these problems than anything the game does.
People often blame the game when the actual cause is a setting they changed weeks ago. If something here stops matching what you see on screen, the game has probably changed a value in an update. If you are short on time, the first section alone is usually enough.
If it is still broken
Most advice on this topic assumes you already know half the answer, which is exactly the problem. Nothing below requires mods, paid tools or an account on some sketchy site. Small details matter more than they should here, so read the order of steps carefully.
- Write down what you changed, so you can undo it if the result gets worse.
- Restart the machine fully, not just the game.
- Check the version you are running before following any step-by-step advice.
- Back up your save if the game gives you the option.
- Restart fully after a change rather than trusting a quick reload.
- Test one change at a time instead of five at once.
Check these first
Start with the simplest option before touching anything that is hard to reverse. If something here stops matching what you see on screen, the game has probably changed a value in an update. There is a fast way and a safe way, and they are not the same thing. Keep changes reversible so a failed fix does not become a second problem.
Driver updates fix this often enough to be worth trying, and break it often enough to be worth noting first. Nothing below requires mods, paid tools or an account on some sketchy site. Small details matter more than they should here, so read the order of steps carefully.
Mistakes worth avoiding
- Following a guide written for an older version and assuming nothing moved.
- Changing several settings at once, then having no idea which one helped.
- Skipping the preparation step because it looks boring, then repeating the hard part four times.
- Trusting a video thumbnail over the actual patch notes.
Frequently asked questions
Could a mod be causing this?
Very likely, if you have any installed. Disable all of them, confirm the problem is gone, then re-enable in batches.
Will reinstalling fix it?
Sometimes, but it is slow and it hides the cause. Work through the checks above first; reinstalling is worth trying only after they fail.
Is there a faster method?
Usually yes, and usually it is riskier. The route above trades a little speed for a much lower chance of having to start over.
Bookmark this if you expect to look up how to fix mouse scroll wheel again after the next update.