cant run dvd properly

[poppy]

hello, i am trying to find a solution for this problem,my friend is using the
driving test success dvds, when he loads the hazard perception dvd,it only
plays two or three of the clips and then everything freezes , i brought it up
to my pc , it runs fine on mine,the theory test dvd is running ok on his ,
its just the hazard perception where it runs small clips to test you, anyone
point me in the direction of what might be wrong,he is on windows xp home
edition service pack 3
thank you

 

[poppy]

update on this , i put the dvd in my computer again and i got "access
violation at address 004A9A8F in module DTS_HPT.exe" as soon as i put it in,
when i clicked ok
it loaded up but only ran for two clips and froze, but i had previously run
it twice all the way through so i thought the problem was his pc as it gave
this error twice on his but previously it had worked fine for him too