Hey Noel,
I don't recommend a wirlesss network set up for any PC running Mach. You can do a search here for wireless network and should get some info. about that. Lots of people run them with no problem. There are settings you can change to help. This may fix all of your problems but, you might be suffering from other network issues as well. I'm no networking Guru so hopefully one of those will speak up here too.
Brett