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Well, after applying the SQL in PHPMyAdmin, and got the exact same result as everyone else in this thread, I checked the error code and found that there are a small error in the SQL.
This is the code that is to be executed:
UPDATE `prefix_user_profile` SET `pm_link` = '<a href="javascript:openWithSelfMain(''{X_URL}/modules/pm/pmlite.php?send2=1&to_userid={X_UID}'', ''pmlite'', 550, 450);" title="Write a message to {X_UNAME}"><img src="{X_URL}/modules/pm/images/pm.gif" alt="Write a message to {X_UNAME}" /></a>'
With this, everything should work out just fine