It would be better to solve it inside of the problem script, but this is an Applescript where the alias enclosed in the quotes is the path to the folder. You'll have to edit the address. Paste into Script Editor, edit, save it as an Application, and add the saved script to your Login item list.
tell application "Finder"
--edit file path
set c to alias "YourHD:Users:UserAccount:Library:Caches:Adobe InDesign:Version 7.5:en_US:Scripting Support:"
move c to trash
end tell