QuickTime update disabling iTunes, Safari

Is no one else having the same problems I am? Upgrading to QuickTime 7.6 wreaked all kinds of connectivity havoc on my laptop:
- iTunes could no longer connect to the iTunes store
- Safari could no longer connect to ANYTHING (really, no URLs led anywhere)
- Firefox could connect to sites, but couldn't download
- Of the 3 Dashboard widgets that connect to the Internet, only 1 kept working (Remember the Moof and Movies stopped connecting)
I couldn't find any way to fix the problem. I had to revert to a full backup.

After installing QT 7.6 via automatic update on my MacBook Pro, the only issue I've seen is erratic mouse behaviour. That is, mouse movements aren't as smooth as they were.
On my Mac Pro however, I can no longer access the interweb or any other computers on my home network. And yes, mouse movements are no longer as smooth as they were before.
I shouldn't have revert to doing a full system restore to resolve this issue.
Thoughts?

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