How to install virtIO drivers for Win 2008 on KVM?

This is a follow up to a pervious question. I have a Ubuntu host with a Win 2008 KVM. To improve performance the network and IO - @dyasny and the documentation recommends installing virtIO drivers. I did follow this :
http://www.linux-kvm.org/page/WindowsGuestDrivers/Download_Drivers

Downloaded the ISO from:
http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/

Now I am not sure how to proceed. I have the Win 2008 VM already installed with the virtual disk in RAW format with an IDE bus.

I opened the iso and have several folders. Like E:\Balloon E:\NetKVM E:\vioserial E:\viostor

I am assuming NetKVM is for the network drivers and viostor is for the disk drivers. For the NetKVM, there is only Vista and XP sub-folders.

Similarly for the viostor: there is a folder structure like below. E:\viostor\Win7 E:\viostor\Wlh E:\viostor\Wnet E:\viostor\WXp

So in summary, my questions:

1. Which folders should we use for Win 2008 64 bit?
2. How do I install the NetKVM for an existing VM?
3. How do I ins tall the viostor for an existing VM?
4. Finally, just out of curiosity, what is Ballon and vioserial drivers for?

Thanks a ton for your help!

Solution 1:

so, as I already mentioned - you have 3 options:

1. hack windows to accept virtio drivers for the boot device (highly unrecommended) and then switch the disk interface to virtio
2. reinstall with virtio, using the drivers you mention this time on a floppy image or ISO attached to the VM
3. slipstream the virtio drivers into your windows ISO and reinstall

Solution 2:

1. I would hazard a guess at the latest versions (Vista / Win7), windows won't happily install drivers that it can't support.
2. Add a virtio nic, start the VM, install drivers when Windows looks for them, remove non-virtio nic.
3. Add a temporary virtio disk, install drivers, remove temp disk and change your boot disk to virtio.
4. The Balloon driver is for Memory Ballooning, but I have never managed to install it on any of my VM's, vioserial is apparently so you can have more than one serial port.