Cause: Internet Explorer 6, which is included with Windows XP, has some security features, that wont let you download “unsigned” drivers. This is a security feature that helps prevent the downloading of viruses and other malicious code. Normally, internet Explorer will prompt you before downloading an unsigned driver, but if the setting has been configured to “block,” then you will not be able to download the driver.
To enable Internet Explorer to prompt you for driver download action, follow these steps:
1. Log on with an administrator account.
2. Click Start--> Control Panel--> System.
3. Click the Hardware tab--> click the Driver Signing button.
4. In the Driver Signing Options window that appears--> click the Warn radio button so that Internet Explorer will warn you before downloading unsigned driver files, rather than blocking the downloading. If you want this setting to apply to all users on the computer--> click the Make This Action the System Default check box--> Click OK.