Have you tried disabling your internet security provider? My Norton Antivirus had a home page protection enabled that blocked all home page changes without notification. Checking your settings on that might help.
I've met the same problem in IE6. The homepage was suddenly set to Acer's global site, and no matter what I do, it just won't change. If I recall correctly, it happened after a few attempts at installing IE7 (which were always unsuccessful). Not even a format of the notebook has helped.
It's quite irritating as I've had a run in with Acer's poor customer service and really have no wish to view their website.
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