MSIAC55.tmp is part of a product called known as InstallShield and the developer is Acresso Software Inc. .
If you think that this file contains a virus or another malware, please download a virus scanner.
If MSIAC55.tmp 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 InstallShield from the list to remove the process MSIAC55.tmp from your computer.
If you have any problems with MSIAC55.tmp, 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 Acresso Software Inc., the developer of MSIAC55.tmp and ask for more information.