This is from the CS5 user guide PDF... but I think the process is the same
without selecting a preset, select the General tab of the New Preset dialog box. Select Desktop from the Editing Mode menu, and customize the settings on the General tab until they match the parameters of your assets.
When I don't select any preset, the GENERAL tab is greyout! Impossible to click on it.
Unless I haven't understand, it doesn't work for me.
Thanks for you help.
As I said, I lifted that from the CS5 user guide
Press F1 in CS4 and read how to create a project using the desktop video editing setting