Can't upload photos to any website?

I am trying to upload pics to various websites but I keep encountering the same problem. Once I start an upload, it uploads anywhere from 1% to 10% then the connection times out or is reset. Pics won't attach to emails either. I've tried using different browsers (Firefox, Safari, IE, Chrome, etc) to no avail and tried an FTP client filezilla which also times out. I've turned firewall off, on, uninstalled it, reinstalled it and tried to upload each time like when it was uninstalled or off and still didn't work. I've added exceptions to firewall and nothing. Same with anti virus software but nothing. I also flushed the DNS cache, forwarded the port to my router to allow but still a no go. I don't really know what else to try, but no matter what, I keep getting the same problem. Safari says "Safari Cant Open The Page. The error is (KCFErrorDomainWinSock:10054)" and Firefox says "The connection was reset. The connection to the server was reset while the page was loading." and the other browsers say something similar. Pls Help!!
p.s. I have tried uploading to istockphoto.com, bigstockphoto.com, facebook.com, gmail.com, etc. but nothing works