title: 'dpinst /silent' fails on Windows XP with signed (but not WHQL) drivers
body: <p><a href="http://msdn.microsoft.com/en-us/library/windows/hardware/ff544842%28v=vs.85%29.aspx" rel="nofollow">Driver Package Installer</a> (DPInst) with the <a href="http://msdn.microsoft.com/en-us/library/windows/hardware/ff544775%28v=vs.85%29.aspx" rel="nofollow">"/s"</a> (silent) flag fails to install a signed driver on Windows&nbsp;XP. The certificate is a valid one (an <a href="http://en.wikipedia.org/wiki/Code_signing#Implementations" rel="nofollow">Authenticode</a> certificate) but not a <a href="http://en.wikipedia.org/wiki/WHQL_Testing" rel="nofollow">WHQL</a> one. How can I fix this problem?</p>