Audio, Video and 64 bit migration.

1) On Vista Home Premium, with Nvidia GeForce 6150 LE, Dungeon Siege II does
not show red dot enemies in the small map Viewer! It is rather slower than on
MCE2005 also. Would be happy to learn how to correct this if there is a way.
Tried the Beta Driver as well, no change.
2) MCE2005 Realtek Audio worked great for Quad setting with Yamaha home
stereo in blue line in plug. Realtek High Def Audio in this HpM7750n does not
goto to blue, though sound? will go to Black RearSpeakers plug. It is
garbled, voice sounding like it came from under water however. Nothing before
with Ms driver, this, after upgrade from Realtek\tw site. Any help would be
much appreciated.
3) The new PC is 64 bit and to realise it's capability, I want to upgrade to
Ultimate 64.
Hp said this would not break warranty and Vista upgrade advisor had no
obvious complaints. Wondering if anyone has gone this route who could provide
some help here. If audio & video don't work properly in 32 maybe I should
forget 64? Do I need new TV hauppauge hardware, video, audio, Lan etc??
Thanks.