No, PCMark05 is officially supported only on Windows XP. It can be run also on Vista and Windows 7 through some tweaking. Windows 8 is completely unsupported for it.
Also PCMark Vantage won't work properly on Windows 8 as Windows 8 is missing some components used by PCMark Vantage. PCMark 7 should work and will be validated as soon as Win 8 release candidate is made available.
Update on the PCMark Vantage compatibility; A patch is in the works for it (no change on PCMark 05)