Windows DVD Maker Error

[jericho]

Hi

I am trying to burn wmv files to dvd via windows dvd maker. Here is some background

i. This used to work
ii. When I kick the process off it burns to about 4%, then it suddenly jumps to 75%, then to 98.8%, then to 99%, it spits the disc out and just says error burning to disc.
iii. Nothing has been burnt as it shows the disc with full disc space available
iv. wmv file(s) I am trying to burn have not prev been in movie maker
v. wmv file(s), each one is about 35 mins, I try to burn one on a disc with 150 mins capacity
vi. I have about 200gb free space on my HD
vii. 3GB RAM
viii. I am using an ASUS M51 VSeries
ix. Vista Home Premium 32 bit
x. ATI Mobiility Radeon HD 3470
xi. I have SP1 installed

Also I have tried all the different burn speeds and different discs all with the same result

Please help as I am getting desperate