If we install Windows XP from original CD, either Professional or Home Edition, it will not be asked number series. But we should activate Windows us before 30 days, because trial 30-day period. Pass from that, do not reply in the activation, we Windows XP will not be used again. Activate Windows means to spend some money. If we have to repeatedly activate because the use to install more than 1 computer, of course, can make you bankrupt. Here's how to remove the activation. (I've tried both on XP Prof. or Home Edition, First, Open Editor registry. Way Click Run> type Regedit>> OK Search this section: HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ WPAEvents Note the string of OOBETimer Double click to change the contents. Whatever the contents, replace with: FF D5 71 D6 8B 6A 8D 6F D5 33 93 FD Click Ok second. Right click WPAEvents directory (still in regedit). Then click on "Permissions .." Widows box will app...