I have problems uploading. After uploading 10-15 min, this error shows up and when I click "ok" the upload stops. I downloaded the new version already, and I desperately deleted the whole album and tried to upload it new... I am aware there are other threads posted before with this issue, but I really have no clue of computers and I hope you can help me and I will be able to solve the problem.
That sounds like a hardware problem. Try shutting off everything - PC, router, cable modem. Then turn it all on again, one piece at a time - first, cable modem, wait a couple of minutes, then router, wait a couple of minutes, then PC.