The best approach is to simply reload the OS from scratch. Provided of course you have the recovery/restore disks -OR- the full install(upgrade, maybe) version of the OS, I assume XP. If none of this, then contact the vendor(Dell, Gateway, etc.) and request the OS recovery/restore disks for your system model, for a small cost or free is none was ever provided to orginal owner.
You can TRY! use the pgm. TweakUI, google for it and get the latest version. Another website I found helpful is this one: http://www.dougknox.com/ and use his helpful pgms..
I purchased a computer that is only 6 months old for my son, I need to change the computers name and set everything for my son's registry.
Any help would be appreciated.