To help we'd need more detail. But random errors is not good if you have mods (or have had mods) installed, then you may need to clean uninstall and reinstall (see section 17 of the WOFF BH&H II FAQ). When you get the error take a screenshot of it first (if you don't know how use printscreen key and paste into mspaint as a new image and save as a .jpg).
Then exit WOFF and gather all the logs and files as requested in the last 2 pages of the FAQ and send to support email. Do NOT post logs here please.
..and no it's nothing to do with CFS3 you do not need the disk or an installation of CFS3 (better if you do not have one actually).
FAQ
https://www.overflandersfields.com/index_html_files/FAQ_WOFF_BH&HII.pdf