Enabling VirtIO makes your Windows VPS run much faster as well as allows much faster disk operations on your Windows VPS vs running on an IDE based disk driver. Enabling VirtIO is pretty easy and it is best to enable VirtIO when installing the OS onto the VPS itself.
Step 1 : Turn off the VPS by clicking on the Power Control -> Shutdown button
Step 3 : Select the Windows 2008 ISO from the ISO list.
Step 4 : Click on Power Control, now start up your VPS.
Step 5 : Click on “VNC” to continue your install
Step 6 : Set the language etc come to the screen where it asks you to select the disk partitions, you'll get a message saying “No disk partitions found” or similar, click on “Load Drivers”
Step 7 : Click on CD-ROM tab and then click on “Unmount”
Step 8 : Mount Virtio ISO
Step 9 : Click on Browse
Step 10 : Select the following folder
Step 11 : You'll get a screen like this, Select the 1st one “RedHat .. Controller” and click “Next”
Step 12 : Select the partition and then, click on “Disk tools/Advanced” (last button on the right hand side) and then Click on “New”
Step 13 : Click on “Ok”
Step 14 : ! IMPORTANT ! Go back to the control panel, Click on CD-ROM tab and then click on “Unmount”
Step 15 : Select the Windows 2008 ISO from the ISO list and re-mount.
Step 16 : Click on “Refresh”
Step 17 : Done! You can now continue the install by clicking on “Next”!