Wifi LAN VERY slow on mac mini 10.6.8

All,
I have a mac mini 1.66 intel core Duo with 2gb of RAM.  The HD crashed a couple months ago and so it has a clean version of 10.6.8 on it. 
In my house I have a Motorola modem (comcast) hooked to a vonage box with wifi.  Off this we run 2 MBP's a wifi printer, and the Mini.
Both MBP's will get 10mb down and 3-5mb up on speedtest.net.
The Mini will get .9 down and .7 or so up.  It also became non-responsive using VNC to control it, so it's not so much that the internet is slow, but more that it just isn't connecting to the LAN with any speed.  It is connected to my router (no security)  with a signal/noise of -75/-98 and a transmit rate of 48.
I had shared my Dish Network box out via ethernet (airport sharing to ethernet) and had done the terminal prompt fix which is found all over the net to allow DHCP on internet sharing.  However, it doesn't matter if I turn off internet sharing, the local speeds are still just terribly slow.
This is a big problem since it's used as our media center for streaming netflix, etc...
Any help?  Where to start?
Thanks,

If reinstalling doesn't help, you'll probably need to contact Macroplant support:
http://www.macroplant.com/contact.php
Regards.

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