My earlier instructions may have omitted too many details.
A. "Dell 2330d/2330dn Mono Laser Printer" (R242568.exe) is NOT a driver. It's a network configuration utility. Executing this file will not help you install the printer.
B. The 140 MB file you downloaded IS the disk you are looking for when you click the "Have Disk" button. But you have to do a little extra work -- and some guesswork -- if simply running that file didn't work (it should have worked -- that is, after you executed that file, you should have seen your Dell printer listed in the Add a printer wizard list of printers)).
- Download (free) 7-zip --> http://7-zip.org/ 7-zip is a very useful file compression/decompression utility, but you can uninstall it after you're done if you want to do so.
- Right-click on the file you downloaded (Dell_2330_2350_ACH_Admin.exe) and select 7-zip > Extract files. This will create a folder with the same name as the downloaded file (without the exe, of course).
C. During the uninstall process, make sure you get to the following screen either by clicking the "Print server properties" button or by using the printui /s /t2 command. Details are here --> http://www.dell.com/support/article/us/en/19/SLN285062/en
When you are at the above screen, select the driver for your Dell 2330d (if present) and click "Remove." Remove BOTH the driver and the driver package.
D. Follow the installation instructions here --> http://www.dell.com/support/article/us/en/19/SLN286269/en
Once again, you will see the screen above. This time, click the "Add" button. This starts the "Add Printer Driver Wizard." This is similar to, but not the same as, the sequence of screens you get by clicking "Add a printer."
You will get to a screen very similar to the one you see in the "Add a printer" dialog.
Once again, you will not find your Dell printer listed, so click the Have Disk button.
- Browse to the Dell_2330_2350_ACH_Admin folder that you created earlier
- There are many sub-folders. Double-click to open the "drivers" folder, then double-click to open the "print" folder, and finally, double-click to open the Win_2kXP folder. Yes, the folder name suggests it's only for Win 2000 and XP, but from having looked inside the *.inf files (see below), I'm confident that these files will work for Windows 7.
- You will see the following screen. This is where the guess work comes in:
You need to select one of the three INF files at the end of the list. I don't know what the difference is between these. If it were me, I would select DKACHL40.inf, but that's not based on any firm knowledge. Pick one, click the "Open" button, and complete the Wizard.
Once the driver has installed, connect the printer. This time, after Windows recognizes it, it should install correctly.