InstUI5.exe is part of a product called known as SiS (R) VGA Install Execution File and the developer is Silicon Integrated Systems Corporation .
If you think that this file contains a virus or another malware, please download a virus scanner.
If InstUI5.exe is using too much CPU or too much memory in your system, it is possible that your file has been infected with a virus. Installing an antivirus is recommended.
Not all processes can be uninstalled without the help of a 3rd party tool, especially malware. To see if it can be uninstalled, first go to Start > Control Panel > Add/Remove programs and select SiS (R) VGA Install Execution File from the list to remove the process InstUI5.exe from your computer.
If you have any problems with InstUI5.exe, you may try using a registry cleaner or a speed-up software to check, analyze, and fix problems that are affecting the performance of your computer.
You may try contacting Silicon Integrated Systems Corporation, the developer of InstUI5.exe and ask for more information.