I don't know of a driver, but you can download from agilent their Spectrum Analyzer compatability guide which cross references their analyzer's GPIB commands and create your own driver. It contains compatable commands for 8563 among others.
http://www.tm.agilent.com/classes/MasterServlet?view=faq&faq-ItemID=1000003541&language=eng&locale=US
I still use the 488.2 board (successfully with WINNT, ME with patch, 95) and don't use instrument drivers, just include the NIGLOBAL.bas and the GBPI32.bas and import them into either a VB project or MS Excel. From what I've seen there are only two basic types of instrument commands, settings and queries (both text), so I don't use a pre-compiled driver. Also been successful at using Microsoft's Winsock ActiveX control for real
-time display re-creation of an Advantest SA display over the internet. Hope this might help.
