I have recently acquired an Acer Extensa 5220 running Windows Vista Home Basic. have an hp officejet 4255 all-in-one that I want to connect. It refuses to connect on the sole ground that I am not the administrator. The computer tells me that I am the administrator, and as the sole user I cannot determine why the set-up will not proceed. Please, what am I doing wrong?

Have you tried right clicking on the setup file and selecting run as administrator. You have to do this alot in vista. Let me know if this helps. I can also provide you with the download of your software so you can run that as administrator as this might help you.
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=2093&lc=en&cc=us&dlc=en&product=351125&lang=en
There is the software if you it doesn't work with your software.
Thanks,
Lee

You need to log in as the Administrator with Full Administrative Rights.. Just because you are the administrator doesnt men you have full rights , this is a security feature in windows vista..

Also ensure you have the windows Vista Driver
here is the link
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=351125&lc=en&cc=us&dlc=en&submit.y=1&submit.x=5&lang=en&cc=us

DIRECT FOR VISTA
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=2093&lc=en&cc=us&lang=en&dlc=en&product=351125

If you have the vista drivers you shouldnt be having that problem , but a work around is
1.) right click on the Setup.exe program and select run as administrator

NB the setup.exe program is the program you rund to install your printer driver, its eighter located on the cd or the file package you download, you may need to extract the package first.

Hi,

Try disabling temporarily your anti-virus program while installing the HO Officejet 4255. If still a no-go or some of the features will not install correctly, thereafter disable your firewall (again temporarily) while doing a re-install.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Just follow this:
How to run a program in Vista with Administrator Rights:

1. Browse to the program you would like to launch as an administrator
2. Right click the program icon and select the option to "Run as administrator"