To use VADV32, you need the following:

• Virtual Advanced v2.10 for DOS. VADV32 is for Windows only, so the OS/2 version will not work with it. The BBS software must be installed and setup correctly. Visit the VADV support page to download VADV.
• You must be running a 32-bit version of Windows 2000 or later. VADV32 uses Netfoss as its fossil driver and it will not work with Windows 9x.
  
  An alternative to Netfoss is mSyncFos. During testing, it worked as expected under WinNT based systems. It is also supposed to run under Windows 9x, but I could not get it to work properly.