When you connect a new hardware device
to your computer, Windows tries to find and
install a software driver
for the device. Occasionally, you might see a notification that a driver is
unsigned, has been altered since it was signed, or can't be installed by Windows. You can always decide whether to install a
driver that's unsigned or has been altered.
A signed driver is a device driver that includes a digital
signature. A digital signature is an electronic security mark that can
indicate the publisher of the software, as well as whether someone has tampered
with the driver since it was signed. If a driver has been signed by a publisher
that has verified its identity with a certification authority, you can be
confident that the driver comes from that publisher and hasn't been altered.
Windows will alert you with one
of the following messages if a driver is unsigned, was signed by a publisher
that hasn't verified its identity with a certification authority, or has been
altered since it was signed and released:
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