Which article you need depends on where it stopped.
- A blue "Windows protected your PC" box instead of w0a: Windows blocked the download. Before you continue past it, check in two steps that the file is really ours: Checking the download really came from us.
- The file disappeared, or a security tool reported it: My antivirus removed the file.
- Nothing happens when you double-click, or the window closes at once: w0a will not start.
- The Windows elevation prompt every time it starts: Why it asks for administrator rights.
- Removing it: Uninstalling w0a. Read it before you uninstall, because what happens to the settings w0a changed is the part that matters.
Why it asks for administrator rights
w0a shows the Windows elevation prompt every time it starts. Here is exactly what it needs those rights for, and what it never does with them.
My antivirus removed the fileA security tool quarantined or deleted w0a. Why an optimizer trips these tools, and how to tell a false alarm from a real one.
Windows blocked the downloadA blue "Windows protected your PC" box appeared instead of w0a. Here is what it means and how to check the file is really ours before you continue.
Uninstalling w0aHow to remove it, and — the part that actually matters — what happens to the settings it changed.
w0a will not startNothing happens when you double-click, or the window closes immediately. The four causes in the order they are worth checking.