I have Adobe Flash 10 & Java Script is enabled, but I can't play any vidos on you tube. Why?

If you keep getting "HELLO, YOU EITHER HAVE JAVASCRIPT TURNED OFF OR AN
OLD VERSION OF ADOBE'S FLASH PLAYER....GET THE LATEST FLASH PLAYER":

don't bother downloading and re-installing the latest Flash over and over and over again.
You will get absolutely nowhere doing that, because that is only adding to the problem.

There can really be only 3 possibilities:
→ something's wrong with YouTube
→ something's wrong with your cache
→ something's wrong with Flash 10

YOUTUBE:
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Your problem could fix itself in a few hours, or the next day,
because YouTube actually shuts down a lot of their servers
every day without telling anyone, (in order to update things).
On those occasions, it's really YouTube's transmissions of
"JavaScript" and "Flash" which are poor, not your reception
of it. This creates "time-out" or "run-time" errors, giving that
message. You can sometimes fix this by either: hitting "F5",
clicking "Refresh", or clicking "Back"/"Forward". PLEASE VOTE.

CACHE:
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If by the next day YouTube is still showing you that JS&FP
message, maybe your "temporary internet files" and cache
memory are full and cannot take anymore. As such, videos
can't even begin to buffer.

"Temporary internet files" are 1000s of little bits and pieces
of websites put on your hard-drive. They'll stay there forever,
slowly plugging up your computer, (like hair in a sink drain)
until you get rid of them. Otherwise, one day your YouTube
will suddenly be "stuck".

Because your computer now has such little space in which
to "cache" a video, YouTube will mistakenly think that your
JavaScript's "runtime environment" or "buffer overflow" is off,
or that your player is "FLASH 7".

The solution to all that is to first exit YouTube, but not your
browser. After, clear your "cache" of all its "TIFs", "cookies"
and "history". (See below.) After that, shutdown and reboot.

FLASH:
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Watching YouTube vids hasn't changed in the past 2 years.
(Believe it or not, you can still use "Flash 8" if you'd like to).
The newer Flash players are giving many YouTubers plenty
of grief -- particularly since there are 11 different "Flash 10s".
It's nuts that there is 10.0.525, 10.0.576, 10.1.218, 10.2.26,
10.2.54, 10.12.10, 10.12.36, 10.15.3, 10.22.87, 10.23.1, as
well as 10.32.18 now.

Most updates are good for only 1 thing:...Software conflicts.
I've never strayed away from 9.47, and many "flashers" use
9.45 still. Think of them as Windows XP compared to Vista.
Look at what the Asker said after this Best Answer of mine:
http://answers.yahoo.com/question/index?…
If that seems interesting to you, here is the appropriate link:
http://www.oldapps.com/flash_player.php?…

Note 1: if you've got an "Accelerator", dump it, burn it, rip it,
kick it, trash it, disable it, uninstall it...get as far away from
it as possible. There are "Torrents", "Messengers" and "Ad
Blocks" that also conflict with YouTube.

Note 2: some longer videos may need "Shockwave" to play
properly.

Note 3: if you downloaded Flash, did you actually complete
the process and INSTALL it? If you have Firefox or IE 8, did
you enable their add-ons?

Internet Explorer 6:
→ Tools → Internet Options
→ Delete Cookies → OK
→ Delete Files → OK
→ Clear History → Yes
→ OK

Internet Explorer 7:
→ Tools → Internet Options → Delete...
→ Delete files → Yes
→ Delete cookies → OK
→ Delete history → OK
→ Close (browsing history window)
→ OK

Internet Explorer 8:
→ Tools → Delete Browsing History
[. ] Preserve Favorites (leave blank)
[x] Temporary Internet files
[x] Cookies
[x] History
→ Delete

Mozilla Firefox 3:
→ Tools → Clear Private Data
[x] Browsing History
[x] Download History
[x] Saved Form and Search History
[x] Cache
[x] Cookies
→ Clear Private Data Now

Mozilla Firefox 3.5:
→ Tools → Clear Recent History
Time range to clear: → Everything
▼ Details
[x] Browsing & Download History
[x] Saved Form and Search History
[x] Cookies
[x] Cache
→ Clear Now

Apple Safari 3:
→ Edit → Preferences
→ Security (tab) → Show Cookies
→ Remove All → Done
after that:
→ Safari → Empty Cache → Empty
after that:
→ History → Clear History

Google Chrome:
→ Tools (wrench) → Clear browsing data...
[x] Clear browsing history
[x] Clear download history
[x] Empty the cache
[x] Delete cookies
Clear data from this period: → Everything
→ Clear Browsing Data