The GUID information used here changes from one Patch to another. Always use the information in the Release Notes for the Patch that you are removing.
Because the Patch is removed via MSIEXEC, the functions inside setup.exe, which normally prevent reboots from occurring during silent processes, are not executed. In order to prevent a possible automatic reboot from occurring after a Patch removal, simply add the REBOOT=R parameter to the command-line option above.
Patch removal is an MSI reinstall function. When a Patch is removed, all features affected by the Patch are reset to installation defaults. Any features not modified by the Patch are left with their current settings.
Update VirusScan after removing the Patch to ensure that the latest versions of the engine and DAT files are run.