Deepak,
I've converted the LabWindows/CVI driver to LV 6.1 for you. All of the needed files are included in the attached Zip file. Here's some instructions on where to place the files:
MI2023_32.dll -- place in VXIpnp/WINxx/bin
borland/MI2023.lib -- place in VXIpnp/WINxx/lib/bc
msvc/MI2023.lib -- place in VXIpnp/WINxx/lib/msc
MI2023/ -- Place in LabVIEW 6.1/instr.lib
Finally, this converted driver is not tested, since I do not have a Marconi 2023 available.
Good luck,
Bankim Tejani