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For IDE part, please excute the setup program of the IDE driver files. Then you can choose uninstall process, and follow up the wizard to complete the process. For VGA part, there are two ways to install your vga driver, by INF file or by setup program. Please read Q11 about the installations. So if you want to get rid of the VGA driver, you need to check which way you can work:
1.By display properties:
a.Click right button of your mouse, select "properties".
b.The "display properties" window will pop up, select "settings" tab.
c.Press "Advanced" button.
d.Select "Adapter" tab.
e.Press "change" button, there's a wizard window, please follow the directions to install VGA driver.
f.Select the 2nd radio button "Display a list of all the drivers".
g.Please choose "Standard Graphics Adapter" as your default VGA driver.
2.By Setup: Go to "Control Panel","Add/Remove Program" to remove the vga driver.

After all process complete, your SiS drivers will be comppletely removed from your computer.