I've installed Vista Business 32-bit on my machine. But, there was
once system hang, so I reboot by force. Then, my start menu and task
bar are something wrong badly.

When I click the start menu, no icons appears at all (even first two
default icons for web browser and mail client). Even I try to change
properties of start menu (to appear program icons on the start menu),
it fails, Properties can't be update.

This problem is also found in the taskbar. I can't change any
properties of task bar. It's always locked. Even though I do right
click on the taskbar and unselect 'Lock taskbar' item, the task bar
still remains in locked.

I think that I should reinstall Vista again. Any help? any reports on
such problems? I tried to reboot in safe mode, but it was same in the
safe mode.

ps) My VGA is nVidia GT7600, aero enabled, nVidia driver is installed.

Thank you,