How do I know if my windows is activated? How does one implement a free activation upgrade? Do I need to activate windows again after Windows is reinstalled?

How do I know if my windows is activated? How does one implement a free activation upgrade? Do I need to activate windows again after Windows is reinstalled?
Click Start → run. In the pop-up dialog box, enter oobe/msobe/a. After you press enter, the system will pop up to show you whether the system has been activated. Step 1. Click the Start menu and select "run" Step 2: Enter oobe/msobe/a in the "open" input box of "run" and press Enter. After you press enter, the system will pop up to show you whether the system is activated. XP easily implements activation-Free Upgrade: 1. Install Windows XP 2. open registry regedit 3. Find the primary key HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ WindowsNT \ CurrentVersion \ wpaevents \ 4. Delete the sub-key lastwpaeventloged 5. Change the child key oobetimer to FF D5 71 D6 8B 6a 8d 6f D5 33 93 FD. 6. Right-click the "wpaevents" key in the registry → "permission" → "advanced" → "owner" → your username → "application" → "OK" 7. Return to the "Security" tab → "advanced" → select "system"> "edit" in the list" 8. Tick all the boxes in the "reject" column. 9. "OK" to exit Re-start found activated. This method can be upgraded smoothly !!! Re-activating Windows XP  To reinstall Windows XP, you must reactivate it. In fact, as long as the WPA. DBL file in the windows \ system32 directory is backed up during the first activation, no activation is required. After Windows XP is reinstalled, copy the file to the directory above.