Nvidia PCI Express Series - Manual (Page 12)

To uninstall the NVIDIA Display Driver software, follow these steps:
Note:
It is highly recommended that you follow the steps in this section to
completely uninstall the NVIDIA Display Driver software before
installing a new version of the software.
Step
1
From the Windows taskbar, click Start > Settings > Control Panel to open
the Control Panel windows.
Step
2
Double click the Add/Remove Programs item.
Step
3
Click the NVIDIA Windows Display Drivers item from the list.
Step
4
Click Change/Remove.
Step
5
Click Yes to continue.
Before Driver Installation
Step
6
Restart your system.
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