What should I do with this Video Streaming problem?
''Cache'' (Temp Internet Files), Virtual Memory, and/or "Page Filing" are near-full and cannot take anymore. Simply delete your Cache (plus "Cookies" and "History"), then clear your Memory with a shutdown + reboot. Afterwards, you will freak at how fast and non-lagging your YouTube will be.
The other thing I should do between shutting-down and rebooting is to TURN OFF both your modem + router for about 30 seconds -- and then turn them back on again.
I have done all of the above and am still having problems with Video Streaming.