here is what your looking for...
On the first boot after install is complete, boot into SAFE MODE
(thats the F8 key) and open regedit.exe
Locate this following key:
HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsNTCurrentVersion
change the \"RegDone\" key value fron 0 to 1
Then find this key:
HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsNTCurrentVersionWinLogon
change \"Activation Required\" key value from 1 to 0
Close regedit and do the following:
Go to StartReboot
This trick is not easy for Wnidows XP ,if you have windows 98 then regdone=\"1\" work.Since Micresoft have more intelegent teme then \"haker world\" ,They track all computer of world using IE 4,IE 5,IE 6 and Windows.So if you are from US and you have not registered copy and you use Internet Then you may be in trouble.If you are not form US .Then nothing to worry about.