Many people have reported problems playing HD videos off Youtube with their Studio 17 1747.  The following instructions have been reported as a fix.

First, be sure to be running the newest files from Dell, the most current updates from Windows Update and make sure your machine is clean of viruses.

 

Step 1 -- Install newer display drivers:

• Download the 10.1 version of ATI Display Drivers
  Note: These drivers are not from Dell and have been modified by a 3rd party.
• Extract the downloaded file.  Download is in Rar format, you can use WinRar or 7Zip if you can't extract RAR files.
• Run the file ati_10.1(8.70rc1)full.exe and make note of where the files are extracted to.
• In the extracted files, open the folder Bin64 and run Setup.exe
• Run through the installation 

Step 2 -- Download and install Flash 10.1 Beta 2

 

• Download this file from Adobe Labs
• Run "flashplayer10_1_p2_plugin_121709.exe", click the agree checkbox and click the Install button.

 

Step 3 -- Reboot

 

• Reboot, duh.

 

 

Now, full screen flash should work just fine.  Additionally, you will find that driver is significantly quicker than the factory driver, at least 30% by my rudimentary tests.  These instructions come with absolutely no warranty, use at your own risk!  Be sure to scan all files with your own anti-virus software, etc.