....eliminating some of the potential conflicts that may be occuring. First, I would install the most current drivers for your modem or ethernet card, depending on your connection type. Drivers frequently cause this type of error message.

Next, follow the steps in the links below to remove other conflicts:

How To Shut Down Unnecessary Start Up Programs

How To Clean Unwanted Files From The Hard Drive

Next, when uploading, you might try disabling your antivirus temporarily. See if that's causing the issue.

Next, here's a link to a Microsoft article that might help:

How to Troubleshoot Windows Protection Error Messages

Hope this helps.