DVD Burning problems

[Lone Wolf]

Hey guys (don't know if this is in right section) but anyway i recently installed Mac OS X 10.5.4 on my Dell inspiron 531 then upgraded to 10.5.8. Recently I tried to burn an iso in Mac OS X and everytime I get Interface error 1: Connection Unstable in Toast and Disk Utility can't burn the image hence it'll say it's done but I get a Coater :S

In About this mac is says:


HL-DT-ST DVD+-RW GSA-H73N:

Firmware Revision: C109
Interconnect: ATAPI
Burn Support: Yes (Generic Drive Support)
Profile Path: None
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -R DL, -RAM, -RW, +R, +R DL, +RW
Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
Media: Insert media and refresh to show available burn speeds

Please Help!