7.6.4 killed my internet connection?

Running 10.4.XX on an Intel iMac.
Installed Quicktime 7.6.4 this AM, and now I cannot connect to the internet on any program. iTunes can "see" my PC on my home network and connect to it, but no iMac programs can access internet. PC gets out as usual, no problems.
I restarted the iMac twice, reconnected everything, and restarted the router twice as well. I ran network utility, and it says networking is working fine.
Any thoughts? Thanks so much!
JP

Try posting in the QuickTime for Mac forum. You'll be more likely to get help there than you will here in the QuickTime for Windows forum.
Regards.

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