Registry in XP

I want to intall anti virus Norton software in xp... in the half way of installation the msg ouccr on my screen that ((( registry edit is disable by the adminstrator) please help me in simple way

r u a limited user or computer administrator?

just i format the harddisk and install new windows

You have to enable the rigistry. Trojan or some software has disabled the registry. There are many programs. google it.

Or your administrator dont have have administrative rights , thanks to a virus/malware. You can check that out from Control Panel -> Administrative Tools -> Computer MAnagement . check whether your administrator have sufficient rights to that or not.