There were significant concerns raised when Microsoft introduced the Registration Wizard which collected name, adr, .. as well as hardware and software information discovered by automated query on your PC. The wizard is not supposed to transmit your hardware / software data without your permission. But more importantly, the personal information you entered is still there in the registry for snoops and hackers to collect. Browse through the Windows NT registry key

HKEY_LOCAL_MACHINE\Software\Microsoft\User Information

and see whats stored there. I saw my name, address, phone number, email address, and zip code. This is not needed for the operating system to function. The Regisration Wizard should have cleared the data. It didn't. Anything you don't want collected by the next security exposure, I suggest you remove. Just remove the data from the keys. For example, on my PC, Default Last Name had a value of Maples. I cleared the key. Win98 and NT2000 both have this exposure. Whether you have one of these operating systems or not, check the above key.