I3wis, I tested it on my Vista VM and could not reproduce any crashes. I noticed that the program must be run with Admin privileges for the pre-requisite portion though. Otherwise UAC won't allow it to write to the necessary locations. I did see one problem with the tetherbot install on the Windows version that I fixed here:
http://www.hotlinkfiles.com/files/2058985_mdnry/tbshell_setup.exe