No video on any site available.It says I need to download adobe flash..

go to the adobe website and download the latest version of flash player. It loads on XP, but single core processors have limited capability for video quality. You may not get the smoothest playback with a single core processor, but it can work.

Also, your security, anti virus may stop flash player from installing. Turn off the antivirus temporarily if you are having problems when installing it. Then restart the computer and turn the antivirus back on.