Computerhilfen.com: is there any problem with windows live essential server?

1)I tried installing windows (http://www.computerhilfen.com/explanation-w-Windows.html) live essential on my 4 pcs with different OS none succeded, It shows unknown error. This never happened till the dae about any other programme, Then whats the problem with windows (http://www.computerhilfen.com/explanation-w-Windows.html) live essential?
2) Is really windows (http://www.computerhilfen.com/explanation-w-Windows.html) 7 RC availabe for download? (http://www.computerhilfen.com/explanation-d-Download.html) I got mail from microsoft but there was no download (http://www.computerhilfen.com/explanation-d-Download.html) optiuon ;D

2 - The Link for the Download (http://www.computerhilfen.com/explanation-d-Download.html) is:

http://www.microsoft.com/windows/windows-7/download.aspx