Radom Freeze but mouse moves, Netinfo problem?

My problem is that randomly my computer will completely freeze with the exception of mouse movements. I was having this problem before, and tried a fresh install, fresh install with no installed programs, new RAM, old RAM, and now with a newly replaced logic board. The freeze happened again today and the clock stopped at 10:52am and got it back by putting to sleep (which took awhile) and then awakening. Here are the system.log entried around the time the problem occured.
Sep 5 10:50:08 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:50:08 BlackBook lookupd[16609]: ni_statistics: Communication failure
Sep 5 10:50:14 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:50:14 BlackBook lookupd[16609]: ni_statistics: Communication failure
Sep 5 10:50:20 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:50:20 BlackBook lookupd[16609]: ni_statistics: Communication failure
Sep 5 10:50:26 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:50:32 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:52:17 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:54:01 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:54:01 BlackBook lookupd[16609]: ni_statistics: Communication failure
Sep 5 10:55:46 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:55:46 BlackBook lookupd[16609]: ni_statistics: Communication failure
Sep 5 10:57:31 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 10:59:15 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 11:01:00 BlackBook lookupd[16609]: NetInfo connection failed for server 127.0.0.1/local
Sep 5 11:01:00 BlackBook lookupd[16609]: ni_statistics: Communication failure
Is there anyway I can disable the netinfo lookup or is this a problem with the network/airport card. Any insight would be greatly appreciated.
macbook   Mac OS X (10.4.7)  

At long last, I have finally found out what it was.
After Apple had replaced the logic board, processor, and graphics card that Netinfo errors were still continuing. Because I had not reloaded the OS since the hardware had been replaced I figured I would give that another shot.
I got the OS installed and updated, Mac OS X 10.4.9, and ran that for just a little while. No problems at all. A few days later I started to layer on my applications, MS Office, Firefox, Internet Explorer (We still need to test web sites here with IE for Mac because some users still use IE.) After a few days, still no problems. I then started to layer on my utilities, Toast, Growl, McAfee VirusScan.
Everything still worked just fine...for a day. When I came in the next day my computer had locked up again. So I removed the utilities. Everything started working fine at that point. I put the utilities on one at a time and ran each one for several days. I finally got to VirusScan and the error's came back. I removed VirusScan and the errors went away.
The version of McAfee VirusScan I was running is 8.5. Currently I am not running any VirusScan software at the moment. Our network team here is talking to McAfee in regards to this problem. Hopefully a solution will present itself.

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