CD Writer/DVD Writer Problem!

I have a Cd Writer (Lite-On) and now install a DVD Writer (LG). With DVD CDs no problem but when I try to Burn a Data CD ( with a Normal CD 750) in the CD Writer or in the DvD Writer my machine Crash, Down and Reboot. I Use Nero 6.0, NTiCD 7.0 and Easy CD. With all software the problem persist. Conclusion: I can’t use a normal CD (not DVD)

Please can help me what happen?

Thanks