OneShotTroubles

So, I use the free photo program picasa to load my pictures onto my computer. For some reason, lately it is not allowing me to import pictures any more. I'm not sure what's wrong but I don't really know how to go about fixing it other than just downloading a new photo editing program. Does anyone know of any good, free photo editing programs?> If so, please post because I am not able to post any of my pictures any more until I figure out the problem.