Missing Textures

I am running FSX and my computer has just thrown a wobbler and reset everything. I am trying to find missing textures in my texture folder and I was using -- ShowMissingTextureAlert=1. Have I spelt this correctly as it doesn't seem to work now. Also FSX is refusing to load FSUIPC but that's another story. Will probably reformat the drive and clear out all the old rubbish. Thanks. Neil