HP Error: No HP devices have been detected

I have a fully patched Windows XP PC talking to an HP OfficeJet Pro L7780 via ethernet. The HP Digital Imaging Monitor is version 7.0.  The HP Solution Center is 70.0.128.000.

Prior to 4/21 it worked fine.  On 4/21 Windows updates were performed, and the device will no longer scan.  It prints fine, but when you click on either the HP Solution Center icon (desktop) or the HP Imaging icon (system tray) you get the same error message:  "No HP devices have been detected.  HP Solution Center will close now."

How do I get the HP Solution center to once more recognize the device on the network?

UPDATE 4/27
1.  Windows firewall has no effect.
2.  I can ping the printer's IP just fine.
3.  I can access HP's web interface and web scan works fine.
4.  The HP appears in Device Manager / Imaging Devices.
Miles_BAsked:
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rindiCommented:
Yes. You should also be able to get to these files via the install download. First the software gets unpacked to a temp folder, in there somewhere you should also find those files.
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rindiCommented:
Check on the HP site for an update to the software, then uninstall and reinstall it.
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Miles_BAuthor Commented:
RE: rindi.   No updates.  Further, It's been my experience that the HP uninstall/reinstall 99% of the time only makes things worse.  Specially if there has ever been an older HP printer installed on the system.

When this printer was purchased the box clearly stated "Windows Compatible" on it.   An HP engineer in Canada told me to not even THINK about trying to use this on 95/98/ME, that worked rarely on 2000 and most of the time in XP.

This was working perfectly prior to an XP update, which was followed by some entries in the Event Log re: C++ libraries missing (they were not, and the error went away upon reboot).  This is the only event that falls between the HP working and not working.  Used to scan; now can't find the scanner (but prints perfectly).

I saw a post elsewhere re: this same issue.  The user was told by HP that the scanner uninstalling itself was "a feature" and not a bug.  I thought that old joke was long gone...
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rindiCommented:
Then still uninstall the software, and reinstall it. usually there are a couple of *.bat files in the CCC directory of the install CD which you need to run one after the other, this will completely uninstall the software. Another option is to use the online chat with an HP guy, they usually try to be very helpful, but the chat can take a long time.
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Miles_BAuthor Commented:
I have seen others recommend performing the CCC .bat files in sequence -- yet I've had HP chat and phone support BOTH tell to run them by themselves.  I've not got the CD with me, so I can't give you specific .bat file names.  

But let me restate your proposed solution.
1.  Back up the partition.
2.  Run each of the CCC .bat files, in sequence.
3.  Reboot and re-install the HP software.
4.  Hope for the best.

Does that capture the essence?
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Miles_BAuthor Commented:
I see the files in a \ccc folder on the CD.  I have had HP's folks tell me to just execute the .bat files directly from the CD.
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Miles_BAuthor Commented:
UPDATE:  5/1

This system is in a real estate office, so much of my work is after hours and weekend.  Got in last night and backed it all up -- this weekend I'm going to try the process as agreed upon here by rindi and myself.  stay tuned....
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Miles_BAuthor Commented:
UPDATE:  5/3

Uninstalled, reinstalled.  It looks like it's going work, but I've not got the ability to scan as .pdf and save.  I'm going back to install the ReadIris OCR -- that may be responsible...

RI OCR software installed.  The unit is scanning and saving .pdf files!  Unlike our former President, I really DO mean it when I say Mission Accomplished!
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Miles_BAuthor Commented:
Thanks SO VERY MUCH for your assist on this one.
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Miles_BAuthor Commented:
FINAL OBSERVATIONS:

I think it may be important that this process be performed before trying anything else that may otherwise befuddle HP's lame uninstall processes.  It's crucial the uninstall .bat files (found on the CD in the \util\ccc folder) be executed sequentially.  
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