Service Tag doesn't match computer

Hi Martin,

You may check service tag of your computer from system BIOS and verify if it is the same that you are trying to enter on support website. You may access system BIOS by following steps below:

• Restart the computer.
• As soon as you see the Dell logo, start tapping the ‘F2’ key on top of the keyboard.
• If you wait too long and the Microsoft Windows appears, then continue to wait until you see the Windows desktop. Now shutdown your computer and try again.
• After this a new window would appear. You can only use the arrow keys of the keyboard to navigate between the options as the mouse is not functional in this mode. 
• Verify the service tag. 

Is there any specific purpose to update the system BIOS? 

The BIOS version 1.1.11 has enhanced compatibility for USB devices and contains changes that impact only certain configurations, or provides new features that may/may not apply to your environment.

You may download the BIOS for your computer from link: http://dell.to/YdOaQh  You may download rest of the drivers for your computer from link: http://dell.to/XrRI02  

Note: Please connect your system to surge protector (If available) to avoid any unexpected shutdown. Any sort of interruption during BIOS update may damage system board.

Please reply for further clarifications. 

Thanks Chimnay, I will do this. The real problem is that my wired network adaptor doesn't work properly, I have to uninstall it everytime and reboot to get it to work. I read somewhere about updating system bios. It's a Broadcom 440x adapter, which I understand may not work very well with Windows 7 which I'm now running?

Cheers

Thanks SpeedStep. It says C521 on the machine, do you mean it there's no bios for C521 so you have to use E521 or C521 never existed?

It wont let you put the wrong bios on your system.  The C521 Uses NFORCE 4

nForce 4 series:
430 / GeForce 6150SE, 430 / GeForce 6150LE, 430 / GeForce 6150, 430 / Geforce 6100, 420 / Geforce 6100, 410 / GeForce 6150LE, 410 / GeForce 6100, 405 / Geforce 6100, 400 / Geforce 6100

Ok found it.  USB will have issues without the chipset driver.

NVIDIA GeForce 6150 LE and NVIDIA nForce 430

nForce 4 series:
430 / GeForce 6150SE, 430 / GeForce 6150LE, 430 / GeForce 6150, 430 / Geforce 6100, 420 / Geforce 6100, 410 / GeForce 6150LE, 410 / GeForce 6100, 405 / Geforce 6100, 400 / Geforce 6100

Chipset - Driver

Description	Importance	Version	Released	Supported OS	Download
nVidia SMBus, v.4.5.7, A02 SMBus INF for MCP51 & MCP55	Recommended	4.5.7	9/15/2006	Windows XP Windows XP x64

Specifications: Dell Dimension C521 Service Manual - Documentation

1.1.11