Hi.. for all the expert in windows operating system..

I am using windows 8.1 enterprise evaluation right now,

I notified be able to use this windows for 90 days, then I use it. I was installing some programs and have done plenty of my work here.

I wanna activate this windows, for all my work and programs not reseted.

please, tell me how..

thanks before for all the anwers..

Once the evaluation period is over, it will not be possible to upgrade the evaluation to a licensed working version of Windows 8.1 Enterprise. You will have to go in for a fresh install .

"Following the evaluation period, you will need to replace the operating system on your test computer and reinstall all your programs and data. It is not possible to upgrade the evaluation to a licensed working version of Windows 8.1 Enterprise. A clean installation is required."

Ref:Activation and Usage Guidance