Did you know that you can install Windows 7 without any license key and use it for 30 days? What you might not know is that you can also extend that trial mode to 120 days, without requiring a key.
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steps :
First click START button ----> type COMMAND ---->write click COMMAND PROMPT and select RUN AS ADMINISTRATOR -------> then type slmgr -rearm and press Enter key
Within a few seconds you’ll normally see this dialog show up, saying that the command has completed successfully, at which point you’ll want to reboot.
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