When drivers are posted, they are posted for the benefit of enterprise
installations on machines where the installation of third party is not
allowed. Picture a company that needs to have all of it's computers
(servers, workstations, etc) using the same installed base of drivers for
the purpose of uniformity and maintenance. The drivers posted on WU are
written to provide baseline functionality of the hardware they are written
for. These drivers are meant for an IT department to incorporate into
their infrastructure so that all machines are using a common driver base,
and that they all have the same functionality. They are not meant to take
the place of manufacturers drivers.
If you are on a consumer computer, you should NEVER use device drivers
posted on WU. you should ALWAYS use drivers supplied by the hardware
manufacturer.
Despite what others have posted, there are significant differences between
the drivers posted on WU and the "same" drivers posted at the
manufacturers website.