Hi, I have a Windows 7 Professional machine but when I want to extend a partition I get a error. Here is a link of the screenshot: http://tinypic.com/r/29oo3lg/7 How is this possible because I am using Windows 7 Professional and this edition doesn't have Bitlocker.

Nobody can help me with this issue?

I don't know if you've found your answer, but it would seem that BitLocker is not available on Windows 7 Professional. It is only available on Ultimate and Enterprise.