I am running Vegas 7 on a Lenovo Core2duo Vista 64-bit laptop, things are a little glitchy.
My biggest aggravation is this:

When I use either Izotope Ozone Plugin or Antares Auto-tune EVO, a *Windows Help & Support* message box will pop up when the plugin is activated/de-activated.

It says
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"Why can't I get Help from this program?

The Help for this program was created in Windows Help format, which was used in previous versions of Windows and it is not supported in Windows Vista.

For more information, see Windows Help program (WinHlp32.exe) is no longer included with Windows on the Microsoft support website."
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I have not had the problem with my Windows XP 32-bit PC with Ozone (didn't have Antares back then).

Could this be a 64-Bit problem with Vegas?
My older 32-bit laptop didn't have the problem.