Go to the Adobe website and try to download flash.It is gonna detect what you have on your computer.
Another solution would be; Dump internet lame explorer as the default browser Install Firefox and try to watch a video on flash player. It is gonna ask you to install the flash player -plug in from the adobe website. Download it and basically you done. To change the default browser from IE: Start-Default-Programs-Set program access as default-Custom- Mozilla-Firefox- un-check EI.