Have to agree with Lokked - try and see if running a wire direct to the modem works

Personally, don't use any wireless at all as I find the cable method both faster and more secure

The only time I have ever seen ghosting is when I blow my monthly usage (12 gig) and the provider throttles my download speed back to some pitiful amount

Can't really help with any software as I am hardware and have 1 instance per machine