Hmmm...thats strange, TFTD never launches a process called Intro on my computer. Just to make sure, I slowed DOSBox to 1 (yes, 1!) cycle so that I saw everything that the program launches upon startup. Basically, the title bar of the DOSBox window went from reading Program: DOSBox to reading Program: Sndstart, then (about 2 minutes later, you definitely wouldn't wanna play at 1 cycle
)to Program: GeoScape.
Incidentally, BEFORE the program starts to play the slideshow/animation, you should get the screen that asks you to choose your language (English, German, French, or Spanish)...do you get that screen, or does it freeze before that? If so, seeing as Sndstart is the first process I saw it call, maybe your sound setup is incorrect? Remember that dos programs have to be TOLD what memory addresses, IRQs, and DMAs to use or they won't work right...DOSBox defaults to SoundBlaster16, address 220, IRQ 7, DMA 1 & 5, so try running SETUP.EXE from DOSBox and setting it for those (unless, of course, you have different settings specified in DOSBox.Conf...check it to see)
Finally, are you running the CD version of TFTD? If so, you will need to either mount your CD drive (MOUNT [thedriveletteryouwantDOSBoxtogiveyourCD] [yourCDdriveletter]:\ -t cdrom) or completely install the program to your hard drive (find the \HARDDISK directory on the CD and copy it to your hard drive)