My Dynavox Speech Synthesis Device has just quit playing YT videos and streaming audio just when I got the Charge Nurse's permission to try music therapy with the "screamer" Alzheimer patient that they keep sedated. I suspect that my HD is too full of mp3 music.

It's Win 7 Home Premium with an Intel Atom CPU and 1 Gig of RAM. I have been experiencing slow initial boot times as well as re-boot times.

I have defragged and restored to earlier date, no help.

It reports 15.2 GB free of 56 GB drive.

What can I do to regain speed. I use to be able to play YT videos without problems but now the little search icon just continues to spin. Yes, I have full bars of WIFI signal strength.

Help, please.