A couple of things:
1) Uninstall Norton, burn any install discs of it and maybe reinstall the OS to make sure there are no traces of it left. Seriously, Norton = bad performance. Use AVG 8.0 Free if you need a virus scanner.
2, 3 & 5) Works for me.
4) Don't use IE.
Moral of the story: Call Acer support, power management should be working, either they botched it up and installed faulty drivers or there's a hardware problem.