Photo Gallery on my Vista Utimate 64 bits doesn't work

Hi all,

I have two installations of Vista; one Business 32 bits on my Thinkpad and
64 bits Ultimate on my home PC.

On my 32 bits Photo Gallery works ok, but on my Ultimate version it hangs
when I try to start a slideshow. It hangs with the Loading message on the
screen. I must end via the Task Manger.

Any ideas anybody?

Thanks in advance.