How can I fix the MSCOMM3. OCX error Arcus Help Center. Place the MSCOMM3. OCX file in the same directory as the Arcus GUI executable. If the library is not included with your software, it can be found attached to this post. This is applicable for Windows XP. For Windows Vista7, the MSCOMM3. OCX file will need to be registered. The steps below detail on how this can be done Place the MSCOMM3. OCX in the C WindowsSystem. If the library is not included with your software it can be found attached to this post. Start Windows Explorer right click the Start button and select ExplorerGo to the C WindowsSystem. Windows Vista Sp2Windows Vista WikiRight click the cmd. Run as AdministratorAt the command prompt enter regsvr. This should successfully register the MSCOMM3. Mscomm32.Ocx Windows Vista' title='Mscomm32.Ocx Windows Vista' />enspenspWhen installing a visual basic 6 project onto vista it all goes smoothly but when i execute the project i get the following errorcomponent mscomm32. Hi, Which version of Windows XP service pack1 or service pack 2 or other mswinsck. Windows Vista see. OCX file for use. Emule 4.9 Gratis Italiano Ultima Versione Per Windows 7 here.