Due to the nature of my work with computers I reinstall operating system so often that there is no point in activating it with Microsoft center. Instead I rather use a command line tool to reset registry time counter in my operating system which gives me additional 30 days of fully functional operating system and since Windows allows to use this hack up to 3 times this gives me altogether 120 days.
To extend Windows trial period open cmd and type in “slmgr –rearm”. Wait a few seconds and see the result.Than use the same hack after 29 days and do it twice more. This way you will be able to use operating system without activating it for a full one third of a year.
Result of slmgr -rearm Command
Written by Thomas editor of www.pcterritory.net
My current trial version is expired so how can i extend my trial limit time
This hack applies only to Windows Vista and previous Operating systems. You cannot apply this hack to Windows 7, because Microsoft removed/relocated time-bomb triggering system.
My current trial version is expred
this Fake one , i tried But it says slmgr is not internal or external command
http://support.microsoft.com/kb/948472