Please follow the below steps.

1. Close everything you have open even the download.

2. Please go to your "World of Warcraft PUBLIC TEST" folder.
-------This is commonly placed C:/programfiles/World of Warcraft Public Test.

3. Find the Green T.
-------This is named Wow
------- Here is a link to it.

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Q u o t e:
http://i676.photobucket.com/albums/vv123/Socksabox/Greent.jpg

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4. Run the client

5. Log in with your user name& password.
--------Common Issues..

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Q u o t e:
5. When I try to log into the PTR realm, it says my username and password are wrong, what do I do?
Your PTR login may not directly reflect what your login is for live servers. The login information used for the PTR is separate from live, and is typically cached from several weeks prior to the PTR becoming available.
What you should do: Please try any current or old passwords when trying to access the PTR. If you have converted to a Battle.net account, please try both your battle.net login, and your previous logins.
If you previously had an authenticator on your account, and have removed it, you may still need to use the authenticator to access the PTR.
If after all of the above options you are still unable to access the PTR, you will have to wait until the next testing phase to try again. We will be unable to deal with PTR login issues on an individual basis.

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6. The Download will begin.


----------For Vista Users------

1. Follow the above Steps 1-3.

2. Right click the Green T.
------ This is the Green T --

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Q u o t e:
http://i676.photobucket.com/albums/vv123/Socksabox/Greent.jpg

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3. Click Run as ADMINISTRATOR.

4. Follow Steps 4-6.


Enjoy!