This problem only occurred with old viewer versions and would result in a dalog about a "badly installed software" being presented by Windows even before the viewer is started. This is not the problem you are encountering here... But since there is no evidence of any crash, it must be something fishy in your system, and not in the viewer (which I have tested on multiple Windows systems and that everyone else is using without trouble).
Also check that neither SLVoice.exe nor SLPlugin.exe get blocked by your firewall and/or anti-virus.