backup help

[soulkeeper]

ok first of all im new to the dvd burning, ok i bought an optorite dvd burner{tight on money} and i have some maxell dvdrw + and when i back up a movie it skipps really bad on my dvd player and my pc. is this something im doing wrong or is it the medium im using? so far ive tried to backup phonebooth and national lampoons christmas vacation. both are know to the pc and will try and play but they skip really bad. also i can only burn the rw's at 2.4x i cannot change this. please help.. tia