Try to choose "Bridged" to wired ethernet (not to default) networking type in the VM Configuration -> Hardware -> Network. Hope this will work, but If it doesn't, there are more thing that can be done.
Hi, it's a bit unclear. Do you mean that when no parallels is running you successfully conect to DSL and able to use it in Mac OS?
So, do you mean that when no parallels is running you successfully conect to wifi and able to use it in Mac OS?