Hi, Les. I'm sorry to read of your problems.
I hope that you have continued to work with support to try to resolve the issue.
If the issue persists, try removing the Acer software suite that is typically preinstalled and active, I believe it is called the eRecovery software. I don't think your problem is due to the backup functions in OneCare, but rather something interfering with the network connection and the Acer software has been known to do this.
You can do a full install of Vista from an upgrade disk - http://windowssecrets.com/comp/070201
-steve