What is FastUser?

In most cases, this file is not required to run on startup and can be run manually.

Process Name: FastUser

Filename: fast.exe

Fix FastUser errors: Run a free scan

FastUser Information: Installs as part of Windows XP PowerToys as an option for very-fast user switching (allowing a keystoke to switch users instead of using the login screen). It is only used for the hot-key switch and yet it hogs 1.5 megs of memory in two separate processes (one run by the user & one by the system). Optional install in PowerToys

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