Deleting former owner accounts

Good Morning,

How does one completely delete all traces of a former owner of a computer? I purchased a computer at an estate sale with XP home edition installed. I was able to go into user accounts and change administrator rights. I then installed a wireless network card. Now, when the computer boots to the logon screen, it still shows the former owner! All I have to do is press enter(no password required) and it continues to load windows. I guess it is not a huge problem but annoying none the less. This is actually the second used computer I have purchased and have the same problem with the first one.
In both cases, this happened after the installation of a network card.

Thanks in advance for any help.

Bill

 

Hi Bill try this
go to control panel>click on user accounts> click on the account you want to delete> then come down to the tab that says delete this account.

 

If that one doesn't work you can also try this one
Click Start, Run and type "control userpasswords2", and click Ok.
find the account name that is popping up highlight it then click remove.

 

Thanks Buggabear. I have already done the first suggestion. I will try the second one this evening. Update tomorrow.