i've been experiencing this exact same issue with firestorm. the second life viewer doesn't work either, or any other viewer. it happened after reinstalling my operaing system. everything else on my computer works, all other games play. i've manually cleared cache as suggested by the other suggestion, but that's done nothing to help, neither has clean reinstallation of firestorm or second life, or updating graphics card, or rolling back graphics card drivers, restarting computer, i've tried every suggestion on forums and wiki's, nothing seems to help. sl just keeps on crashing. i'd love help with this issue.