I recently did a fresh install on new system and had trouble getting my Tick Marks / Medals back for completed scenarios. After calling in the help of the http://railworksamerica.com/ forum crew it turned out to be a piece of cake. So I thought to post it here for others to use. Simply copy file Railworks\Content\SDBCache.bin from the old install to the new install. Thats it. Some people make regular backups of this file and in that case there is some great help at the page below on how to put that backup back with out losing Tick Marks received after the last back up. http://railworksamerica.com/index.php/learning/tutorials/item/204-restore_missing_marks_scenario
You should make regular back ups of your entire Railworks folder, and after any updates or new installs, check everything thoroughly before updating that back up. That way, you're covered for literally any eventuality. Just drag and drop whatever you need back on to your main Railworks folder... or even the entire thing if it really goes pear shaped. Always have back up... for everything. Your entire machine should be backed up ideally.