Help needed for installing Snow Leopard on XPS 630i

I am kind of desperate here, i am trying to installing snow leopard now for the last 7 days, and i can't get it running.

I am not really a newbie on this topic, cause i have successfully installed snow on a Sony Vaio, and a Dell XPS420.

On my own machine a XPS630i i can't get it running, then only if i install it on my usb hard drive. Kinda annoying because i can't see my hard drives wen i am in OSX, just the usb drives.

Okay, i have tried, hazard, iAtkos 3, usb methods, followed up some "guides" but non of them work :'(

Keep getting a error that tells me he could not enumerate a device.

"The IOUSBFamily was not able to enumerate a device"

Is there a smart man inhere that can help me out? I would be so happy to get it up and running in any possible way…

to all that gonna look at it…

My specs are

PC: XPS 630i Processor type Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz| System chipset NVIDIA® nForce 650i SLI Northbridge C55 Southbridge MCP51 BIOS chip 8 MB | Videokaart Nvidia Gforce GTS 240 | Geheugen 8gb | More Info ↗