Cleared your temp files out recently? Sounds like it could be that your temp files are rammed to the hilt and the RAM is having trouble storing enough data to allow the video's to stream fully, and there isn't enough room to save the pics.........?

Open INTERNET EXPLORER, go to TOOLS > INTERNET OPTIONS, click DELETE FILES. When the pop up windown opens tick the box that says DELETE OFFLINE CONTENT and the click OK

If you haven't done this for ages then it's gonna take some time, and it will appear like it's crashed. You just need to leave it alone, and don't use the PC while it's working. Leave it alone and come back in 10mins or so to have a look.

When it's done, delete cookies aswell.......