All videos are very choppy such as HULU or utube and machine seems to run slow in general . Start up and shut down seem to be slow also.

Speed up videos on your computer by:

-- cleaning system junk
-- optimizing computer services
-- optimizing internet
-- repairing registry
-- defraging registry
-- clearing browsers junk

do these things with some secure tool such as Intel Software Partner Reginout.

Downloaded videos can sometimes play "faster" than your Internet connection can download them, in the same way that parents can never keep enough food in the refrigerator to feed their teenagers.

Start downloading the video, and click 'pause' to let the download continue for 30 to 60 seconds, and then click 'play', to see if the video is "smoother" when the "buffered" content is being read from your local disk-drive.

If not, then the "performance" of your computer needs to be investigated.
How much RAM in your computer?
Windows 2000? XP? Vista? 7?
Is your anti-virus software working correctly?
Have you recently done a "full" virus-scan -- computer-viruses can cause your computer to slow down.
Disconnect the Ethernet cable from your computer, and then reboot.
Does the reboot go faster with _NO_ Internet connection?