I've finally done it, i went with option 1 using the Linux based update package from within Xen following the instruction from this page supportapj.dell.com/.../3onliner.htm
My Bios & firmware are now up to date, but still having issues with my DVD drive not recognizing my DVD so still troubleshooting that.
But again thanks for all your help guys, its been great & gained a lot of learning from it.
Cheers