Sony PCG-K415B User Manual page 163

Or:
1 Click Start on the taskbar.
2 Click My Computer from the menu.
3 Click View system information on the left of the window.
4 Click the Hardware tab, then click Device Manager.
5 Double-click the option corresponding to the device you installed, then double-click your device.
The Properties dialog box appears.
6 Click the Driver tab.
7 On the Driver tab, click Roll Back Driver.
You have your previous driver back.
You must be logged on to your computer with administrator rights in order to complete this procedure.
Restoring your computer does not affect or change your personal data files.
For more information about System Restore, see the Windows Help and Support Centre.
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Customising your computer