Centris 610 locks up when I use the MacTCP applet

I have a Centris 610 running 7.5.3. I got this used, and it has not been any trouble before.
I recently purchased an Asante FriendlyNet Transceiver AAUI-15 to RJ45 from eBay, and it works fine as far as I know (lights come on on the transceiver and the connecting hub). However, when I try to launch MacTCP Admin or MacTCP applet, one of two things happen. Normally, the whole system just locks up as soon as the applet opens. Occasionally, I will get a flashing pop up with a bomb in it, no text, and I can't click to make it go away.
Because the system seems to be working fine everywhere else, can anyone help me determine why this is happening? Normal apps like Word and Excel run just fine, and the system starts and shuts down normally.
Thanks,
hbchrist

I do use a router, a Linksys wired model. The Centris has MacTCP preloaded from the previous owner, the transceiver I got off of eBay.
Here is the physical setup; Centris with transceiver connected to the AAUI port. Cat5 cable to a 10Mbps switch. Hub uplinked by Cat5 to an SMC multiport 10Mbps hub. Hub connected to the router by Cat5. I have other systems connected to the SMC as well.
The Centris boots normally to the desktop. It is only when I attempt to open the MacTCP applet or the MacTCP Admin applet that the system locks up. I have opened the applets with the transceiver both connected AND disconnected, but both situations yield the same result. I have not, at this writing, opened the Network applet.
When the applets start, I can see the previous owner's settings, but I can't change them because of the lockup. While I can always wipe the drive and reload the OS, I would like to solve this before taking such a drastic step. All other apps work like a charm, so I believe that there is something else I am missing.
Thanks so much for your interest and assistance.
Cordially,
hchristian

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