mkorner,

Please follow the instructions below and then tell me what happens.

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 for the best communications.

Disconnect your printer. Download and run this patch to completely remove the printer from your computer. Run the patch, a MUST on Vista machines, until 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)

***To install drivers, sometimes the file unzips and does nothing. You have to look for the setup.exe file, right click on it, then left click run as administrator*** 

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. If you don't have the disk, then Simple OCR should work nicely with your printer.

You may also need to read this,  

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.

Let me know what happens and how you're connected.

Rick