Wow, that really is an "old" system
Ok, sorry, but let's see what we can do to help.
First of all, are you using the latest BIOS version?
On Asus' website there's an update that fixes some issues with the sleep mode for 64-bit operating systems. The latest BIOS is over two years old and there's no official driver support for Windows 7, but there are some Vista drivers that might work.
You can get the AMD Cool 'n Quiet utility from AMD afaik as it's not specific to the motherboard, but rather the CPU.
No idea about PC Probe, but have a look at Speedfan
which in my opinion is a far superior utility.
The S/PDIF connection found is most likely that of your graphics card, as it supports S/PIDF pass through if you use a DVI to HDMI dongle.
You might want to try these SoundMAX drivers
from Asus, although they are for Vista, but they should still work with Windows 7.
Funny thing, seems like I did a review of the A8N-VM CSM a few years ago http://www.trustedreviews.com/motherboa ... erboard/p1