What build(s) are using? Which mediavp have installed? Have you made the installation according to the guide in FSwiki? Wich graphics mode are you using (OGL vs DX8)? Have you configured the launcher properly?
And can you post the error message here?
I am using FS2 open version 3_5, as the other builds would crash me after 3 minutes. i have all the vp files for the retail game (i have hotu), i have one media vp, which makes subspace jumps light blue (model.vp, i think), i have followed the FSwiki guide, and i am using Direct X. i have direct x 9.0c. the launcher is also configured to run "fs2_3_5" or something. i have the random tiger launcher.