If these modules already exist on your system, then disregard this step. However, it's best to make certain you have the most recent version of FSUIPC.dll as it is updated every few months. You may find the most recent version by visiting this web-site:
If you can't see the .dll files, make certain your folders are configured to "show all files". In windows explorer, click VIEW, FOLDER OPTIONS. The "folder options" window opens. Under the "View" tab, click the radio button "Show all files", then click OK.