Dell printer 720

It's some kind of communication error. I would suggest uninstalling the printer from the second computer. Also, make sure you go to the website for that printer and download the latest driver that was designed for Vista 32bit. If you are using the included software disc it may not have the latest driver updated that fixes this problem.

1. When connected by a USB cable, reseat both ends of the cable going from the computer to the printer.




2. When connected to a wired or wireless network, make sure the network is working correctly and that the printer is connected to the network.
(to make sure the printer is on the network, print a network set up page, for more information on how refer to the user's guide, refer to the Downloading and Viewing Printer Manuals section for information on how to download and view the user's guide).



3. Restart the computer.




4. Turn the printer off.




5. Unplug the printer power cord from the A/C outlet or surge protector and wait at least 30 seconds.




6. Plug the printer power cord back into the A/C outlet or surge protector.




7. Turn the printer back on.




8. Make sure the desired printer is set as the default printer.


• For instructions on how to check which printer is set as the default and change it if needed, Click Here
  



9. Print a test page.


• For instructions on how to print a test page from Windows, Click Here
  



10. Run the automated printer fix available from Microsoft.
    
    • For instructions on how to run the automated printer fix available from Microsoft,
      Click Here (This automated fix may uninstall your printer driver.)
    
    
    
11. Uninstall the printer driver, download and install the latest printer driver.
    
    
    • For instructions on how to do so for Dell printers, refer to the Dell Knowledge Base article:
      How to Download and Install Printer Driver Download Page.
    
    
    • For help with non-Dell printers, refer to the Non Dell Printer Drivers, Manuals and Support section.

did you install the Windows 7 driver for the printer and did you follow the instructions according to the illustrations given ?

if you dont have the Windows 7 driver for the printer, here is the link
http://support.dell.com/support/downloads/download.aspx?c=us&cs=19&l=en&s=dhs&releaseid=R80999&SystemID=DIM_P4_4600&servicetag=&os=WW1&osl=en&deviceid=7087&devlib=0&typecnt=0&vercnt=2&catid=&impid=&formatcnt=0&libid=40&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=106108

go to http://www.siliconguide.com/drivers/device/4/ and download your driver

The problem could be because of ONE out of FOUR problems listed below. Try the steps recommended and it should fix the problem.

• Drivers Issue: Try uninstalling the printer drivers using the utility http://ftp.us.dell.com/printer/R166248.zip .Then install the drivers from the support website. Use the link: http://support.dell.com/support/downloads/driverslist.aspx?c=us&cs=19&l=en&s=dhs&ServiceTag=&SystemID=PRN_INKJET_720&os=WW1&osl=en&catid=&impid=
• UAC issue: If you are using Windows Vista or Windows 7, a feature called User Access Control (UAC) would block the printer communication. Disable it, and it should work. Use the link http://www.petri.co.il/disable_uac_in_windows_vista.htm for tips on how to disable UAC.
• Print Spooler Service Error: Either the service is stopped or not started correctly. Try restarting the printer spooler services on your computer. For tips on how to restart the Print Spooler service, use the link: http://www.ehow.com/how_2319117_restart-print-spooler-xp.html
• Firewall Issue: Maybe your firewall is blocking the connection to your printer. Try allowing access to all applications related to Dell or printer or communication systems under Program Permissions in your Firewall program.

Thanks,
Abhishek

All you should need is the driver for this to work properly. You can download the latest driver for the Dell InkJet 720 here:
http://support.dell.com/support/downloads/download.aspx?c=us&l=en&s=gen&releaseid=R80999&SystemID=PRN_INKJET_720&servicetag=&os=WW1&osl=en&deviceid=7087&devlib=0&typecnt=0&vercnt=1&catid=-1&impid=-1&formatcnt=1&libid=40&fileid=106108

First, shut down your computer and priner. Unplug both from the wall outlet, Unplug the printer from the computers USB receptical. Next, plug both the computer and printer back into the wall, and turn on ONLY THE COMPUTER. After the computer is fully initialized, plug the printer into the computer's USB socket and turn printer on. A small window on your screen should say:NEW HARDWARE FOUND. it will ask if you want it installed, click on YES. and just follow the onscreen instructions, and make sure your printer driver is compatible with VISTA..To check, go to http://support.dell.com and left click on WINDOWS VISTA SUPPORT. Left click on LATEST VISTA DRIVER UPDATES, and follow the onscreen instructions to check what you have now, and what you may have to download.. If, after downloading and installing VISTA COMPATIBLE SOFTWARE,you still get the communication message, try this: On the windows screen, left click on START. left click on CONTROL PANEL, then left click on PRINTERS. Find your Dell printer icon and RIGHT CLICK on the icon.. On the drop down menu, left click on PROPERTIES. On the Properties window, left click on the PORTS tab. Make sure USB VIRTUAL PRINTER PORT FOR DELL is checked. If no, select that port, left click on the check box, also check ENABLE BIDIRECTIONAL SUPPORT and ENABLE PRINT SPOOLING boxes. Then left click on APPLY, then Ok. The Dell printer icon should show READY. Try a test print to check operation.

Reinstall the printer driver.
Get the latest driver from Dell.com Drivers and download.

Click your start menu, select run. Type services.msc and make sure print spooler is set to automatic and is started.

I have to make some assumptions here, let me know if I'm wrong. I assume you're using Windows Xp (Pro or Home). If so, disconnect the printer from the computer. Go to the Control Panel/Add Remove Programs. Uninstall the Dell printer. Go to the Control Panel/Printers and Faxes On Menu bar, click on File come down to Server Properties. in box that pops up click on Drivers/ Click on the Dell printer, click on Remove. Go to: http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=PRN_INKJET_720&os=WW1&osl=en&catid=&impid= Download the latest driver for your Operating System to a location on your computer so that you know where to find it. Reboot your computer. Go to the downloaded driver. Double click on it. Follow the directions on the screen. It will let you know when you need to connect the printer to the computer again. That SHOULD do it. If it does not, please let me know before you rate this solution. I will try to provide additional information. Ed