I cannot get rid of the Register Now popup from Dell.

According to the following website...
Dell Inspiron BIOS Password Recovery

Each Dell Inspiron has a master password that clears the BIOS password. Call Dell Technical Support at (800)624-9896 to get this number.

Dell Technical Support will request the Service Tag and Express Service Code from the bottom of the Inspiron.

If the current user is not the original Inspiron owner, Dell will transfer the used Inspiron's registration from the original owner with only the Service Tag and Express Service Code from the tag on the laptop.

To transfer a used Dell Inspiron's registration, fill out the Transfer of Ownership form on Dell's web site. See... http://www.tech-faq.com/reset-dell-bios-password.html

register the laptop with dell. thy will give you the code over the phone for free.you can transfer ownership even without knowing the previous owners name. simply enter "unknown" when the form asks for previous owner

Dell Inspiron BIOS Password Recovery

Each Dell Inspiron has a master password which will clear the BIOS
password. You can get this number by calling Dell Technical Support at
(800)624-9896.

Dell Technical Support will request the Service Tag and Express
Service Code from the bottom of your Inspiron.

If you were not the original owner of the Inspiron, Dell will transfer
registration of the used Inspiron from the original owner with only
the Service Tag and Express Service Code from the tag on the laptop.

To transfer the registration of a used Dell Inspiron, fill out the
Transfer of Ownership form on Dell's web site.

Dell Inspiron BIOS Password Recovery

Each Dell Inspiron has a master password which will clear the BIOS
password. You can get this number by calling Dell Technical Support at
(800)624-9896.

Dell Technical Support will request the Service Tag and Express
Service Code from the bottom of your Inspiron.

If you were not the original owner of the Inspiron, Dell will transfer
registration of the used Inspiron from the original owner with only
the Service Tag and Express Service Code from the tag on the laptop.

To transfer the registration of a used Dell Inspiron, fill out the
Transfer of Ownership form on Dell's web site.

Hope it would help..

You can get the master password for your Dell by calling Dell Technical Support at (800)624-9896.
Dell Technical Support will request the Service Tag and Express Service Code from the bottom of your Latitude.
If you were not the original owner of the Latitude, Dell will transfer registration of the used Latitude from the original owner with only the Service Tag and Express Service Code from the tag on the laptop.
To transfer the registration of a used Dell Latitude, fill out the Transfer of Ownership form on Dell's web site.

LOOK AT THE BACK PANEL OF YOUR SYSTEM WHERE WE HOOK UP ALL THE CABLES... THERE WOULD BE 2 WHITE BAR-CODED STICKERS ONE OF THEM HAVE THE WINDOWS OPERATING SYSTEM PRODUCT KEY AND OTHER ONE WOULD HAVE YOUR DELL SYSTEM'S SERVICE TAG AND EXPRESS SERVICE CODE...

If DELL says that they won't provide you the support if the system is under warranty just because of the service tag then juss get this information

1) who bought the system from DELL i.e. on whose name it was registered??
2) The SHIPPING ADDRESS which was given when the system was bought...

If u didn't bought this from dell but fro somebody else then

10 Get his Full Name?

2) His address where he was residing when he bought the system??

3) Any Documents Bill/Shipping Paper/Billing Paper?

Get these information it would really help..

Otherwise Visit this link and fill in few details and get the OWNERSHIP TRANSFER done on you name..

http://search.dell.com/results.aspx?s=gen&c=us&l=en&cs=&k=ownership+transfer+form&cat=sup

first you never should give your service tag.

next call Dell - they will not provide the information other than to a registered owner who can prove ownership.

To clear the bios password you will need to contact Dell support for the master pass code. You will first be required to be the registered owner of the machine. If you're not, then follow the first link bellow and register ownership. If you don't know the previous owner, just type in ebay. Then follow the second link for the contact info for the master code.

http://support.dell.com/support/topics/global.aspx/support/change_order/tag_transfer?~ck=ln&c=us&l=en&lnki=0&s=gen

http://support.dell.com/support/topics/global.aspx/support/dsn/en/document?c=us&dl=false&l=en&s=gen&docid=E21A18454B4A6550E030A68F27286358&doclang=en&cs=

If all you need is to register ownership into your name follow the link bellow and it will take you to Dell's ownership transfer page. If you have another issue with the machine get back to me and I'll see what I can do.

http://support.dell.com/support/topics/global.aspx/support/change_order/tag_transfer?~ck=ln&c=us&l=en&lnki=1&s=gen

No problem. If this is a windows passwod, you will need to boot into safe mode by hitting the F8 key at start up. Once you're in safe mode, log in under the administrator, from there you can go into user accounts and clear the password.

Now if this is a bios password, you will need to contact Dell support directly. You will need the service tag and express code from the bottom of the machine. They will give you a master code for the machine to get you past the password. They also require that you are the registered owner of the machine in their files. This is easy to do, there is a tag in the left hand corner of Dell's support page that reads register ownership. The link bellow will take you to the contact info you need to call Dell support.
http://support.dell.com/support/topics/global.aspx/support/dsn/en/document?c=us&dl=false&l=en&s=gen&docid=E21A18454B4A6550E030A68F27286358&doclang=en&cs=#1