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Did not mean to imply you are an idiot, but your post provided no information other than "it does not work", and your report number. This is a USER FORUM, most of those replying are not employees, and therefore we cannot see your report ID. "Help, it doesn't work" with no further information does not help anyone to help you.
The video you posted helps, did you actually read the error when you try to register? It tells you that the key is already in use.
I had to view it twice because you did not leave the error on screen long enough. This error either means that you have registered the product already to a different email account, or your registration key is already being used by someone else.
If it's just a different email account change your Parallels account email so that it matches what you are typing into the registration box. Likewise the password will need to match. Once registered some features MAY BE enabled that are not at present. I do not know if running from BootCamp is one such feature.
You are on the forum and you have made it to Parallels web site. If the help menu does not work you can go to the Support menu (http://www.parallels.com/support/) and elect to get phone support or create a support request. I suggest you take a deep breath and not bite the head of whoever you get. On the Forum we are just fellow users trying to help each other out, however your tone seems a bit harsh to someone only trying to gather more information to assist you during his free time on a Sunday.
Quote: I'm not trying to get help from another user. I'm trying to get help from a developer.
Sorry to have bothered you, but since the title of this section of Parallels Support is "Parallels Forum Connect with fellow Parallels users" you have clearly come to the wrong place...
If you do not want to deal with another user trying to assist, and instead want someone from Parallels to assist you then please go to http://www.parallels.com/, curser over Support and either select "Create Support Request", "Phone Support Hotline." If you are registered as a developer with Parallels then you may have access to "Priority Desktop Priority Support".
Please request help through the above listed links. It is not fair to say that a company does not provide good customer support if you have not requested support directly from them.
It is a bit like posting on Facebook about a problem with your X-Box and then getting mad at Microsoft because they did not reply to you.