Hey,

The new hard drive shouldt have changed your service tag . Im just wondering what it was that your trying to do now? Are you trying to connnect to your nework? Could be a saved username that was on the old hdd stored some where. What software are you using?  need a little more info and ill see what i can do.

Yes I am trying to connect to my network.    Basically I have 3 laptops.  When I transferred files previously over the wireless link my two other XP machines were displayed by their Service tag numbers.     Since the new hard drive has been fitted to one of my machines it displays a different name or number, which I took to be the Service Tag, since when I tried to search for it's Service tag number on the Dell website it was unable to find it, so I assumed the new number displayed must be it's Service tag.  When I search for information on this particular computer it does not show a Service Tag No or Express Code No however when I go to Advanced Information this new name/number is displayed as 'System Name' and also as it's 'User Name'.

Whatever it is, when I click on it it requires a User Name and Password.  I've no idea what user name and password it is that is required.  I have many combinations of user name and passwords that I use to access web sites but I can't see it being one of those.  I have tried my Dell log in, mp isp and my router log ins without success.  I have also tried the User Name that the advanced information gave as that seems to be the most likely one, but I've no idea of a password and I have tried pretty well all the passwords I use.

This laptop is using Vista, but when I hit 'Network' it used to display the device by it's system tag number prior to one of the laptops having a new hard drive fitted.     I can still send files to the other computer though, as I said, by pasting them into the 'Public' file on this 1720 computer and then accessing them on that computer.