I installed windows 2008 R2 Entreprise with a trial period of 180 days and i'ts allready finished after only 2 weeks why ? Thanks

Have you followed the instructions here http://technet.microsoft.com/en-us/evalcenter/dd459137.aspx and registered you your copy here http://technet.microsoft.com/cs-cz/evalcenter/dd459136.aspx Here is knowledge base article on expiration http://support.microsoft.com/kb/2021579/en-us Regards Milos