1) Close OMS.2) Select the line of text below, then press CTRL + C to copy it.%USERPROFILE%\AppData\Local\Marvin Windows and Doors\Marvin Order Management System3) Press the Windows key + the letter R. 4) Press CTRL + V to paste, and then press Enter.5) You will see a folder with your OMS username on it - DO NOT OPEN IT. Select it, and then press the Delete key.6) Select the file UserSettings.dat, and then press the Delete key.7) Start OMS.