Activation Error Notice After Windows 7 Installed

[techhowdy]

Hi,
Recently I installed windows 7 in the computer. Not original version. I installed cracked version. After that windows working good, But lot of time a pop up window comes up and ask activation key how to fix this.? Thanks

 

[OvenMaster]

Cracked = illegal.
You need to buy a legal, genuine copy of Windows.

 

[techhowdy]

Ok, I will do that