serializationStream error message

I am using a Toshiba Satellite with Windows XP Media Center Edition SP2 and an HP Printer-Scanner-Copier model 1315v.  Everything was fine until a week ago.  Then when I tried to open the HP Director or HP Image Zone or HP Document Viewer I get the error message:  "The program has encountered an unexpected error:  Parameter cannot be null.  Parameter name:  serializationStream"  At that point the HP application shuts down, although I can still print documents and copy, but I can't scan.  I have talked with the HP support folks three times, uninstalled and reinstalled the HP software, and the problems persists.  Recently the same error message appeared before I even tried to use the HP device.  So I think that the problem is with the Windows software rather than the HP software.  I have my Toshiba Recovery and Applications/Drivers DVD.  What can I do to fix this problem?      
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Try the following:

 1. Right click on your Image Zone icon on the desktop and click Properties
2. The target listed should look like this
"C:\Program Files\HP\Digital Imaging\bin\hpqthb08.exe" What you need to write down is the last part (hpqthb08.exe) remember, your file may be different than mine which I am using as an example.
3. Go to your start menu, click on settings, and open your control panel.
4. Double click on Administrator Tools
5. Double click on Microsoft .NET Framework 1.1 Wizards shortcut and a window will pop up with 3 options, select "Fix an Application".
6. Locate the file you previously wrote down in step 2 and double click on it
7. The wizard should ask you to if you would like to restore the file, click yes and follow the rest of the prompts (I can't remeber them exactly) until it leads you to run the file in "Safe Mode" and select that option.

(may not be relevant for XP SP2, though)

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JPaulCAuthor Commented:
Well, your suggestion above seemed very promising.  So I carried out all the steps, many of them more than once.  The program was thoroughly uninstalled, reinstalled, and still the problem persisted.  I located the driver for the Satellite on the Toshiba website and downloaded it.  It just finished the driver installation, and it STILL won't work.  Any suggestions?
JPaulCAuthor Commented:
Well, I finally spoke with Toshiba's support service(?) and have been convinced that because of this and other problems (please refer to my other two questions), I should simply reformat the hard disc, reinstall my programs, and reload my data.  I am in the process of backing up again my data as much as possible.  I want to thank each of the contributors above.  You folks have put a lot of effort into helping me, and I appreciate it greatly.
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