Have an xpcom not found error, reinstall executable does not run!

I am on Windows Vista, German version.
I deleted an old folder which I thought wasn't used - unfortunately, it was the Firefox folder, and only some files were deleted. Ever since, I keep getting the error "xpcom not found" when I try to run firefox.
I tried to download a fresh copy of the installable. When I run it, it asks me whether I wish to run it as the current user, or another one. If I click on "current user", then nothing happens. Nothing at all.
If I click on the user "administrator", along with my Windows password, then it says my credentials are invalid. I have no other user on my laptop; my current user has administrator rights.
What do I do, please?

Hello,
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
Please report back to see if this helped you!
Thank you.

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Hi Spex,
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Attachments:
configData1.zip ‏353 KB

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error list:
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http://wiki.oracle.com/page/Oracle+Discussion+Forums+FAQ
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You have a similar problem like I had.
You seem to have a too old JAVA environment for the browser - I had a too new environment.
For all who are experiencing the same problem!
Problem:
You're compiling your applets with a quiet modern compiler (i.e. Netbeans Version 3.5.1)
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- That's it, you can compile your applets in a previous version of JAVA so that "older" browser user don't have to install a plugin for the new JAVA environment.
Have fun!
If you have any questions I would be pleased to help you.
If this tip helped you already I would be pleased if you would send me a quick email with your experience.
My email: [email protected]

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JDeveloper does this intentionally..
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I don't explicitly say ROWID=:3, what I mean, I
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Have an xpcom not found error, reinstall executable does not run!

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