Live Preview has been disabled "automatically" in my Office 2007

Live Preview worked for a few days, and now it doesn't. When I went into the
Word Options, the "Enable Live Preview" is grayed out. If I hover over it,
the following message appears:

"Previews have been automatically disabled based on Terminal Server
settings, connection speed, or animation settings on this machine."

Anyone know how I can get it back? This is happening on my new Dell XPS
M1210 Vista Home Premium machine and at work on a Dell Windows XP machine.