16. Disable Unsigned Driver Dialogue

First go to: Start > Run
Then type: gpedit.msc and hit enter. Browse the folder tree to the following location

User Configuration > Administrative Templates > System. Right-click Code
signing for Device drivers and select Properties. On the Settings tab, either select > enable, and then select ignore from the appearing listbox..> or click the disable option. Click apply and Ok and your set!

Alternatively especially for XP Home users:

Open "System" properties (Windows key + pause or Right click 'My Computer' -
properties or Control Panel - System).On the Hardware tab click the "Driver Signing"
button. In the dialogue that comes up choose "Ignore" to install the new driver
anyway.