Windows installer stops responding on the message "preparing to install..." which was immediately preceded by a fully completed progress bar under "installing visual C++ 2005 runtime..." (but that message box does not go away). Files have unpacked just fine, v. 5.86 was 8.52 MB, v. 5.87 beta a1 was 6.73 MB. Both fail to install. I'm running Windows Vista 32 bit. Any suggestions?