http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=PRN_ALL_A948&os=WNT5&osl=en&catid=&impid=

mariedm24,

Please follow the instructions I provided and you should be able to print using the wireless network.

First, let's make sure your computer has the latest Windows Updates, especially .net framework, needed to run many applications and the latest Java.

I recommend that you use these Recommended Wireless Router Settings to get the best communications between the printer and all the computers.

Disconnect your printer.

Download and run this patch to completely remove the printer from your computer. Run the patch(a MUST on Vista machines) untiul it prompts you to restart your computer.

Restart your computer.

Download the proper drivers.

XP Drivers

Vista 32-bit Drivers

64-bit Drivers

All other drivers

Install the proper drivers. You'll be prompted when to connect your printer(powered on)

Please remember to install the latest firmware for the 948 Printer. 

As for scanning, if you have the disk that came with the printer, then insert the Printer disk and stop it from running. Go to My Computer and double click on it. Look for the drive with the Dell disk in it. Right click on it, left click explore. Look for the OCR Folder. In the OCR Folder, there is an Abbyy Folder. right click on setup.exe, that's in the Abbyy Folder and left click run as administrator. This will install the OCR program.

Scanning

Scanning using USB connection, open the Dell All-In-One Center, click on scanning and copying and scan from there.

Scanning wirelessly, use the scan buttons on the printer.

Also try reading

How Do I Connect a Dell™ Wireless Printer to a Wireless Network

Choose your printer. Beneath your printer, select your operating system. You'll be redirected to another page. Then click on show all steps. It will walk you through the installation process.

Rick