Try a complete uninstall:
Unplug the USB cable from your PC.
[If it is a WinVista Operating System Then in Go to Start> Control Panel> Programs and features delete all the entries you see for HP.( If it promts a restart do not restart now)
Rest all steps wil be same as winXP]
If it is a WindowsXP Operating System then:
Go to Start> Control panel> Add or Remove programs. and delete all the entries you see for HP.( If it promts a restart do not restart now)
Then open my computer> C:drive> Program files> and delete the HP Folder only (not Hewlett Packard)
Then Open C:drive> Program files> Common Files and then delete HP and Hewlett Packard folder.
Then Go to C:Drive> Windows> Temp and empty the temp folder as much as you can.
Then go to Recycle bin and empty recycle bin.
Then Insert the All-In-One CD and cancel the installation process.
Open the content of the CD> and open Util folder> Then CCC> Then click on Uninstall_L4 and follow the on screen process.
After all restart the computer.
And if possible download the software from HP website:
For WinXp:
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=mp-49256-2&lc=en&dlc=en&cc=us&lang=en&os=228&product=3192753
Then click on download only and then follow the on screen instruction to install the All-In-One, ONLY PLUG THE USB CABLE WHEN PROMPTED DURING INSTALLATION.
Fo WinVista:
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=mp-49256-2&lc=en&dlc=en&cc=us&lang=en&os=2093&product=3192753
Then click on download only and then follow the on screen instruction to install the All-In-One, ONLY PLUG THE USB CABLE WHEN PROMPTED DURING INSTALLATION.
Let me know if any problem.
Good Luck
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