JennaVictoria Twine

I have downloaded the SL Viewer, but it will not open. I have had an SL account for about 5 years now, but I can't use it. I find the icon on my desk top and I click on it, but it will not open. I have tried to access it through my start menu too, and nothing. Help? I am running Windows Vista and have had SL on here before...I deleted it a few years ago and just tried again to download it. But it literally will not open. The crash logger does appear as I am logging on...if that helps?