Re: "You Tube" says I don't have the flash player - but I do.
Please try this workaround, as it worked on my wife's computer a couple of weeks ago...
Go Start > Run > type in the box C:\WINDOWS\system32\Macromed\Flash
Now copy the Flash9.ocx file and then pasted it back in the same directory.
You will have created Copy of Flash9.ocx; rename it to Flash.ocx.
This effectively will give you two files; Flash.ocx and Flash9.ocx, both the same file; although with a different name, in the same directory.
Give this a try and post back with the results.
If it works, Don't fix it!
Especially if Microsoft made it!