ok, problem is the drivers do not work with windows 7 as they are all three, you need to use Vista which is what the computer and drivers are designed for or get a wireless adapter such as this one
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Which will work, else to do a proper factory restore to return the computer to new condition with drivers installed you do the following
Turn off your computer.
Turn on the computer and when the Dell logo appears on the screen, press F8 several times to open the Advanced Boot Options menu.
Note: If the Advanced Boot Options menu doesn't open, wait for the Windows login prompt. Then restart the computer and try again.
Use the Arrow keys to select Repair Your Computer and then press Enter.
On the System Recovery Options menu, select a keyboard layout and click Next.
On the next screen you can log in as a local user or the Administrator.
Note: Use the drop down menu to the right of User name: to select the local user or the Administrator account and enter the password ***** that account. If you have not set up a password ***** the local user account leave the password ***** empty and click OK.
Depending on your configuration, you may need to select Dell Factory Tools and then Dell Factory Image Restore.
Click Next to open the Confirm Data Deletion menu.
Select the Yes, reformat hard drive and restore system software to factory condition check box and click Next.
Note: The restore process begins and may take five or more minutes to complete. A message appears when the operating system and factory-installed applications have been restored to factory condition.
After the restore operation is complete, click Finish to restart the computer.
The computer is as new, and wireless will work, but before doing this backup your files first (programs you need to install again) as this removes everything.
But you will need to do one of these two options.