When I go on Youtube I can not Sign out of my account and when I clic on a video it wont load and play HELP?

There could be contradicting "cookies" which may

have placed themselves on your computer or your

memory is full and can not display things properly.

Exit out of YouTube (but not your browser) and do

one of the steps below. Afterwards, shutdown and

reboot. Not only will this "unclog" your computer's

cache memory and your "cookies", everything will

come across as fresh and new in YouTube's eyes:

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 3.5/3.6:

→ 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

DON'T FORGET TO SHUT DOWN AND REBOOT

AFTER DOING ONE OF THE ABOVE.

I had this problem myself on YouTube and also signing in to Google Gmail. But I found a solution so maybe it will work for you. Follow these instuctions:

Go to C:\Windows\System32\Drivers\Etc and find a file called HOSTS

Right click HOSTS and go to properties then make sure it isn't a read only file. If the box next to read only is check than uncheck it.

Open it in notepad and delete any lines after

# localhost name resolution is handled within DNS itself.

127.0.0.1 localhost

::1 localhost

Save the file in notepad hopefully the problem is solved.