Vista - Live TV in Window Pain

Hi All,

Running Vista Premium on a custom HTPC. Live TV works fine in full screen
mode, when I restore to a Window it hangs, stops and starts, no fluidity.

This is a dual boot system with WinXP MCE. The XP version runs fine and
does not have the same problem.

H/W is an Intel DG965WH MoBo, Core2 Duo 6700, 2 GB Ram and two WD 500 GB
SATA drives in IDE mode with XP booting to one and Vista booting to the
other. A Hauppauge PVR MC 500 Dual tuner card and an XFX GeForce 8800GTX,
with a DVD-I out to an LCD screen.

Error messages are recorded for an ehmas.exe (sp?) (Event ID: 1000) with no
help at MS KB's.

It seems to be a common problem so if anyone can point me in the right
direction, I'd be much obliged......

Thank you,
Jeff