If the process has been running for hours without progress, you can safely "End Task" in Task Manager.
A corrupted Click-to-Run cache is the #1 cause of a stuck scrubber. setupprodoffscrubexe top
No legitimate distribution occurs via email attachments, peer-to-peer networks, or third-party “driver update” sites. If the process has been running for hours
The file is the official Microsoft Office Support and Recovery Assistant (SaRA) uninstall tool. It is designed to perform a "deep scrub" of Microsoft Office products when standard uninstallation methods via the Control Panel fail or leave behind corrupted files. Overview of setupprod_offscrub.exe setupprodoffscrubexe top