How to make clean re-installation?
Uninstallation
-Open the Start Menu
-Open Control Panel
-Open Programs
-Click on Programs and Features
-Select Garena - Fifa Online 3
-Click on Uninstall/Change
-A new window appears and simply click on Uninstall
If you run into problems uninstalling Fifa Online 3, this is usually indicative of a larger problem with your Windows registry. It may be a good idea to run a registry cleaner like CCleaner.
Open CCLeaner and click on the third tab “Tools”
Look for Garena – Fifa Online 3 and “Run Uninstaller”
To clean your registry, go to the second tab “Registry” and Scan for Issues
After the scan is complete, press on Fix selected issues.
Confirm that no Fifa Online 3 files are left on your hard drive
Navigate to the directory where Fifa Online3 was installed (Computer > OS C: > Program Files(x86) > Garena Fifa Online3 by default) and delete any remaining GarenaFO3 File and Folder(s)
Delete the folder containing the old setup files you used to install. This folder is named FO3 and placed on your GarenaDownload Folder by default. Kindly check the appropriate folder (e.g. Downloads or desktop) if you changed the directory.
Delete any instances of FifaOnline3.exe from your computer.
Make a search by typing FO3 and FifaOnline3 in your Search Box to ensure all files are deleted.