When my DVD is working..computer goes bizerk!!!

[rebekic]

Hello m8's

I recently bough Asus DVD +-r/rw Dual (model: drw-0402p/d)....Now..whenever my DVD is working (copying, burning opening) mouse pointer goes bizerk...disappering/appering, computers slows down drasticly, even now when i type my DVD is burning and letters are 3-5 seconds late!?!?!?...I have relativly fast machine...

mobo: Asus p4p8x
processor: 2,6 GHz Pentium Intel (800Fsb)
Mem: 2x256 DDr Kingston (400Mhz)
Os: Win2k SP4
Grafic: Abit FX5200 128 Mb DDR

H E L P!!!!!

p.s. My friend sugested that it might be PSU....i have 280W..could this be a problem ...I tested in Probe ....12v goes on 11.975 and back ... 5v does to 4.999