http://zotero.org/support/word_processor_plugin_troubleshooting#zotero_toolbar_doesn_t_appear

It seems like people are having different experiences getting Zotero set up with Word 2010. For me, it just worked immediately. You could try looking at these threads.
Zotero Forums - Word 2010 broken with latest version of the Word plugin
Zotero Forums - Office 2010 beta with beta 2.0 not working
If none of that is helpful, you should post additional information, like what exactly is not working. Do you see the Zotero toolbar at all in Word, do you receive any error messages, etc.?

I cannot find a the Microsoft data folder as described in troubleshouting (additional steps in Word 2008 or later ...)

The troubleshooting page says nothing about "Word 2008 or later". Sorry, yes it does, but it says "Word for Mac 2008 or later". That doesn't apply to you.

You need to tell us exactly what you've done from the section I linked to above for us to be able to help you.

There's more to that section...

In Word for Windows and Word 2004 for Mac, make sure that the Zotero toolbar is enabled in View→Toolbars. For Word for Windows, also ensure that Zotero.dot appears and is enabled in Word's Tools→Templates and Add-ins window.

Does it show up in that window when you start Word? Is it checked?

You should never need to open it manually (nor adjust your security settings). If it's in your Word statup folder (the path of which is displayed in that dialog) it should be loaded automatically.

But seriously guys, is there really no way to make the Zotero toolbar show up if all the above steps don't work?

I tried uninstalling and installing again everything that was possible and clicking "reinstall the components" (it doesn't show you any confirmation like e.g. "OK - reinstalled" though, is it normal?) but the Zotero toolbar just isn't there (and there's nothing about Zotero in the Add-ins section of Word settings).

That's really annoying.

Oh, I've got Windows 7, Office beta 2010 and the newest Zotero & winword plugin.

Zotero.dot is in

C:\Users\myname\AppData\Roaming\Microsoft\Word\STARTUP

I enabled the Developer Tab, selected Add-ins and provided the path to the Zotero.dot under Global Add-ins.

You shouldn't need to add it manually. If Zotero.dot is in the directory specified in Templates and Add-ins, it should appear automatically at startup. (Very occasionally you might need to enable it in that window, but not manually install it.)

I'm not sure if that has an effect, but I'd recommend removing it and making sure Zotero.dot is located in the correct directory.

The toolbar is there in Word, that's good, but clicking anything results in nothing but the "Zotero experienced an error updating your document"...

Provide a Report ID. And tell us whether it works in a new document.

The path should be listed in the Templates and Add-ins window in Word.

I am having a bad case of the the no-matter-what-i-do-it-won't-show-up problem with Zotero.

I have Zotero 2.03, Firefox 3.6.3. I am using Word 2010 Beta

I have manually installed the zotero.dot file in the Windows STARTUP folder

I have reinstalled, uninstalled...many times over the last week, with no luck. The main problem is that I cannot find the add-in anywhere in Word, even after reducing the security settings (enabling macros).

Is there anything else? I am beginning a large project and am hoping to rely on Zotero

I am having the same issues as the above user Lockesilver. Was a solution found?

I am also receiving the error, "Zotero experienced an error updating your document."

Is there no help or support for these issues?

I have Windows XP Professional SP3 and Office 2010, both in Portuguese.

After the installation, the zotero.dot file was located in C:\Documents and Settings\Lino\Dados da aplicação\Microsoft\Word\Startup.

I solved the problem of not see the toolbar, copying the zotero.dot to C:\Documents and Settings\Lino\Dados da aplicação\Microsoft\Word\ARRANQUE ("Arranque" is the portuguese translation of "Startup".

Regards.

The toolbar also won't appear in my installation of Word 2007. I am using the current version of Zotero and latest Word 2007 plugin. I tried reinstalling the plugin but that didn't work.

Zotero.dot is in C:\Documents and Settings\MyName\Application Data\Microsoft\Word\STARTUP

Word will load with the toolbar if I manually click on the Zotero.dot

ADDED:
I figured out the solution for my problem at least which turned out to be similar to what had been suggested earlier although the route was a little different.
In Word 2007:
Office Button-->Word Options->Add-ins-->Manage Templates
Check box next to Zotero.dot

Not sure how this got unchecked as the toolbar had been loading previously.

It would be interesting to know which versions are using those that have the word plugin working.

I have Firefox 3.6.7, Zotero 2.0.3 and Zotero Word plugin 3.0a4.
But it is not working. :-(