Optorite not running exe files

Hi I was installing an optorite DDo201 with thw latest firmware into a pcchips m811 motherboard with the latest bios when i came across a weird problem
I used a fresh install of windows xp pro sp1 and tried both with and without the motherboard drivers but still have the same problem
the dvd will nor run an exe file ie nero.exe or office 2003 or any file which needs to be run if i swap out for another dvd ie nec2100 everything works fine…faulty dvd you say , but when i put the optorite into mnother machine it works fine. Any ideas?

just an update on my problem, dvds work fine, all files run fine games install etc. The problem is only with cds and cr-r/rw even autorun wont run