Perhaps you guys should add on the AICCU page that the tap32 driver is not working as is on Vista x64. (cant test it on x32, perhaps anyone wants to do that?) But there is a installer version out by openvpn.net. Just grab the packet and choose only the tap32 driver (openvpn-2.1_rc13-install.exe). it could be done by a bunch of workarounds (self sign driver, windows test mode etc) but this looks much better/easier for all user in my opinion.