Hard to say sokha, the information you provide is rather sparse.

a) Which videos have you tried so far?

b) You realise of course, that part 0 of the car has no video, only files..

c) Unless you've paid $$ for points, the only videos you can download are in the FreeTutorials section.

d) If you've paid and are getting corrupted downloads, use the VIP feature to download each part of the tutes in pieces, ensuring that the checksum is correct for each piece (the number that tells you if the file got corrupted)

Help us to help you, mate.

Simon.