Problems with my computer

For the past week or so I have been unable to upload any photos to any website. I can't upload to Blogger, Snapfish, Shutterfly, Facebook, or WalMart. It's very frustrating. You all are missing so many pictures that we've taken over the last few weeks. If anyone has any ideas what the problem might be, I'd love to hear them. When I try to upload, I get an error message that I'm not connected to the internet. It's like something is kicking me off the internet just when I try to upload photos. Anyway, it's really aggravating.