Follow the instructions below and everything will install for you.
First, let's make sure your computer has the latest Windows Updates, especially .net framework, needed to run many applications and the latest Java.
Disconnect your printer. Download and run this patch to completely remove the printer from your computer. Rin the patch until it prompts you to restart your computer. The patch MUST be run on Vista machines.
Install the proper drivers. You'll be prompted when to connect your printer(powered on)
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 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.