Windows XP Pro: The Missing Manual, Second Edition

Driver Signing

Every now and then, when you try to install the software for one new gadget or an-other, you’ll see the warning box shown in Figure 14-5. It’s telling you that Microsoft has not tested this driver for Windows XP compatibility and programming solidity. (Technically speaking, Microsoft has not put its digital signature on that driver; it’s an unsigned driver.)

If the message shown in Figure 14-5 appears before you, your first instinct should be to contact the manufacturer or its Web site to find out if a newer XP-certified driver is now available.

If not--for example, if the manufacturer has gone to that great dot-com in the sky--you may as well try to install the driver anyway. If it seems to make your system slower or less stable, you can always uninstall it, or rewind your entire operating system to its condition before you installed the questionable driver. (You would use System Restore for that purpose, which is described in Section 16.1. Windows XP automatically takes a snapshot of your working system just before you install any unsigned driver.)

Tip

If you’d rather not contend with the “unsigned driver” message every time you install something, you can shut it up forever. Conversely, you can close up Windows like a vault, so that it will never accept unsigned drivers, for maximum, conservative safety. (Instead, you’ll see a message declaring that the installation has been “blocked.”) Instructions for setting up both scenarios are in Section 8.28.

Figure 14-5. The ...