The heart of the problem:
If you connected the multi-function printer/scanner to your PC and then
installed the printer drivers/software, the chances are very high
that the printer may work but scanner function will not.

Most scanners or multi purpose printers require
that you install the software before connecting the scanner or
printer/scanner.

Step By Step Instructions:
1) Disconnect the multi-function printer or scanner.
2) Uninstall the printer/scanner software and twain drivers using
the Add/Remove programs option.
3) Look/search for folders associated with your printer/scanner model that
contain 'Twain' files, if the folder(s) still exist after the uninstall,
then delete these files and the associated folders.

Note: In the list of files that Search has found you can ignore any
files listed in:
C:\Windows
C:\Windows\system32\....
C:\Windows\ServicePackFiles\.....

NOTE: In the C:\WINDOWS\twain_32 folder you may have
one or more files. The one "not to delete" is named: wiatwain.ds
(wiatwain.ds is installed by Windows XP)
Any additional files in this folder were most likely created when you
installed the printer/scanner. Check each files 'Properties' and if has the
brand of your scanner (Epson, Cannon, HP, Etc) identified as the
company/brand, those files can be safely deleted.

On my PC I have my HP scanner's twain file located in:
C:\Program Files\Hewlett-Packard\Precisionscan Pro 3.1\TwainCtrl.ocx
There should be something similar on your PC, so in my case at least
I would uninstall the HP Scanner software and if that 'TwainCtrl.ocx file
is still there after uninstalling the scanner software I would delete it.
I also have a second twain file named 'Twain_32.dll' located in:
C:\Program Files\Adaptec\Easy CD Creator 5\PhotoRelay

4) Check Device Manager and remove any entries if necessary.
5) Create a Restore Point
6) Scan registry using the brand name/make of the scanner as key word for
search. (Delete any entries found, but be certain it's a scanner related
entry)
7) Reboot the PC and once again check Device Manager,
it should not show any listings for the printer/scanner.
8) Now reinstall the software and twain drivers.
9) Shutdown the PC.
10) With the PC power off, connect the printer/scanner and then
restart/boot to Windows.

Note: Sometimes it's might help if you try a different USB port if you
printer/scanner is a USB device.

One easy way to test your software installation's twain driver are working,
is to use a graphics editor named IrfanView.
http://www.irfanview.com/

If you download, install and run this software,
located in the menu bar is an option named 'File'.
On selecting the 'File' option you should find an
option (near the bottom of the list) to named:
'Select TWAIN Source', click on this option
and a popup should then display valid Twain sources
for you scanner. If you see your scanner listed,
select it, and then try to scan an object (Photo).

By selecting Twain Source from the file menu IrfanView should load
your scanner's software and then scan.

If you choose the 'Copy Shop' option also in the file menu you have the
ability to bypass your scanner's software and directly scan a photo into
IrfanView. Try the 'Copy Shop' option and let me know what happens.
Note that 'Copy Shop' will list both your scanner's Photo editing/scanning
software and the hardware name (make & model) of your scanner when
you click on Copy Shop's 'Select Twain Source' button.
You should choose the scanner's hardware option.

For instance on my PC the Photo editing/scanner software is named:
'HP Precisionscan Pro 3.1'
The second entry in Copy Shop's 'Select Twain Source' list is my scanner
make and model which shows as:
'WIA-Hewlett-Packard Scanjet 5470C 1.0'

So for me when using Copy Shop I select the second entry when
asked to select a Twain Source.
I then check the 'Show Twain Preview' box.
(I check this option so the scanned image does not go directly
to the printer, but instead is displayed in IrfanView).
Next I click the 'Start' button located a the bottom of the Copy Shop
window to start the scan.

--
JS
http://www.pagestart.com



"Mark D. Stotzer" <marks@mvps.org> wrote in message
news:uNYSrR%233JHA.1528@TK2MSFTNGP05.phx.gbl...
> In attempting to reinstall software for my faithful HP 5510 Officejet all
> in one device from original CD and keep getting error:
> "A more recent version is already installed...(but it does not say of
> what!)"
> Even tried latest versions of same from HP.com-same result.
> This started because I simply went to the HP website, downloaded the
> latest drivers, installed them like normal folks do and now can't get back
> to my original setup which was wroking fine earlier that day.
> HP was no help in three chat and one phone session. Each of the level1
> chatsupport folks had an idea of what was the problem: XP or Office SP3 or
> IE7; etc. Their level 2 support consisted of trying to sell me a
> replacement printer.
> The facts:
> I have XP with SP3, Office 2003 with SP3 and all online updates to both.
> I can print and manually copy but not scan or FAX with my 5510 because I
> need to reinstall the HP Director and Image Zone software.
> I tried their removal toll to level 4-no help.
> Just want to try a clean reinstall......even if I need to dig through the
> registry, etc.
> Thanks is advance....
> -mds
>
>