I have Sharp AR-5516, and I want to install it on Windows 2008. But I couldn't find its driver. How I can do it?
There is no driver for the Windows Server 2008. The 2008 version is related to the server release. However, I recommend downloading the available drivers, then you can attempt a possible installation.
Drivers page hosted by Sharp: http://www.sharpmea.com/cps/rde/xchg/ae/hs.xsl/-/html/product-details.htm?product=AR5516&cat=341