ARMSVC.EXE is also known as the Adobe Acrobat Update Service. This is a Windows background service belonging to the Adobe group of utilities. This file is not necessary to your system's operation and may be removed from start-up. But, if you are using Adobe products regularly, it may be wise to keep this service around considering Adobe has multiple feature and security updates for their products.
This process is installed along with one of the following products from Adobe Systems:
To quickly check if this is an Adobe service, the ARMSVC.exe file is should be inside "C:\ProgramFiles\Common Files\Adobe\ARM\1.0\". Or it may be in "C:\Documents and Settings" instead. Moreover, you can verify if the file's signature is by "Adobe Systems, Incorporated".