HP m7674n and Vista problems

I just "upgraded" from XP Media Center on my HP m7674n to Windows Vista Home
Premium edition. I am having a couple of problems:

1. I have Microsoft Wireless Comfort Keyboard and Mouse. The problem is
that my screen saver never runs. I had the same problem with XP. The
solution was to use msconfig to disable "ehtray". After doing that the
screen saver worked fine. I have done that with Vista but screen saver still
does not run.

2. When playing World of Warcraft the sound is sometimes distorted and
often has pops and crackles. The distortion is particularly noticable at the
character selection screen.
I have updated the video driver (nvidia GeForce 7300 LE) from the nvidia web
site to their version 100.54 (new as of 1/30/2007). I have also updated the
sound drivers (Realtek High Definition Audio) but these changes have not had
any effect.
Some pertinent things: The game worked perfectly on the same hardware under
XP. The machine (hp m7674n) is completely stock...no boards have been added
or removed although I have quite a few usb peripherals. I have not yet
encountered sound problems with any other software.

I hope there is a fix for this! The sound problem is irritating enough to
make me switch back to XP but I will hold off on that as long as I can stand
it.

Rick Schaeffer (rschaeff@comcast.net)