Windows: windowsxp is already actived

HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents

OOBETimer, 71 -> 72.
%systemroot%\system32\oobe\msoobe.exe /a
DHXQ2-WRGCD-WGYJY-HHYDH-KKX9B
%systemroot%\system32\oobe\msoobe.exe /a

V2C47-MK7JD-3R89F-D2KXW-VPK3J
Q6TD9-9FMQ3-FRVF4-VPF7Y-38JV3
FPJC9-YTC23-GHKTW-D87K6-WHJPQ
JG28KH9Q7XBH6W43PDCQ6XBFJ

other links:
http://www.exforsys.com/tutorials/csharp/delegates-in-csharp.html