that sound card will work. I use creative. It should work right of the bat. You will be able to tell running from the live cd what works and what doesnt. If it doesnt work its usually a pretty painless solution. Your interface on the other hand, may or may not work. I bet it does, but the live cd will tell you that as well.
Also seriously, when you do you install shrinking a partition to make room for linux is not hard. Your overthinking the hard drives,which will cause confusion.
Run from the cd, then open a terminal window and type sudo gparted at the command prompt. You will get a graphical device that looks at you hard drive(s) and partitions.
you will get something that looks like this
http://kajar.files.wordpress.com/2009/0 ... ed-gui.jpg
this guy has a hard drive named hda
hda is devided into 3 partitions:
hda1
hda3
hda4
partition hda4 has within itself another partition, hda5
where is hda2? maybe he deleted it, or he just skipped it in the naming. They yellow in the partitions is how much space is used. the white is how much space is open. this is also listed textually below the graphic.
in the top right is a hard drive selection menu. any other storage devices will be in that drop down, other hard drives, external drives, thumb drives, memory cards, ipods etc.
hard drives are named hd or sd
usb devices are named something else, like sdd (that varies from device and computer).
on the example I gave, hda1 contains a file type ntfs. this is a windows file system so you can safely bet thats where his windows partition lives. It would be his C drive. on this example there is no f drive. if there was another partition with the nfts file system on it, that would probably be his c drive.
hda3 or 5 contain his linux os and files. He has no room to shrink and install any more oses, but if he had plenty of white left, he could shrink one and load another os in the room created. This is the procedure you would do during an install.
Seriously, use the live cd, you cant hurt anything unless you really try to, for example, in gparted dont move anything, just look at it. thats about the only danger from the live cd.
Here is how an OS works, when you boot, the computer loads the OS into your ram from the hard drive. so with the live cd its loading into your ram from the cd instead. Changes made only happen in the ram. The hard drive is not being used. when you reboot, the ram resets itself. the hard drive never new there was another os in the house. you have to do some work to mess with the hard drive from a live cd, and it is very very unlikely that you will accidentally do that.
The live cd will be slower than an installed version of linux, so be prepared for that.