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Your product key probably doesn't work because Microsoft only gives you a certain number of licenses when you buy Office, and you've probably used them up. (It's usually either 1 or 3.)
Call Microsoft's tech support line and tell them what happened, maybe they will reset your license so you can reactivate Office. Otherwise, you'll have to buy another license. (You can do that from Microsoft.com.)
Click the Microsoft Office Button , click Excel Options, and then click Add-Ins.
View the add-ins and application extensions that are categorized as follows:
Active Application Add-ins Lists the extensions that are registered and currently running in your Office program.
Inactive Application Add-ins Lists the add-ins that are present on your computer but are not currently loaded. For example, smart tags or XML Schemas are active only when the document that references them is open. Another example is the COM add-ins that are listed in the COM Add-ins dialog box. If the check box for a COM add-in is selected, the add-in is active. If the check box for a COM add-in is cleared, the add-in is inactive. To learn how to open the COM Add-in dialog box, see the section called Turn off or manage the installed add-ins.
Document Related Add-ins Lists template files that are referenced by currently open documents.
Disabled Application Add-ins Lists add-ins that were automatically disabled because they are causing Office programs to crash.
Try a Repair Install with your WinXP Bootable CD.
If Repair option fails you will have to do a Clean Reinstall of WinXP as a last resort. Some details: 1. Boot with your WinXP CD 2.At the "Welcome To Setup" screen, Choose the option: To setup Windows XP now, press ENTER.DO NOT choose !!!!To repair a Windows XP installation using Recovery Console, press R.IGNORE To quit Setup without installing Windows XP, press F3 3. Accept the License Agreement and Windows will search for existing Windows installations.
4.Select the XP installation you want to repair from the list and press R to start the repair.
If Repair is not one of the options, under the Circumstances you are in the next option will be Clean install
5. I this does not work it might be your memory --download and burn to cd memtest (http://www.memtest86.com/) and test your memory for errors.
If your internet connection works try activating it online. If not you will have to call Microshaft and give them the number generated by the 'phone option' if the internet activation will not work.
Call this number to get your system activated.
Just tell them you had to reinstall and you have no major upgrades and you have only installed XP on one system and they should give you a number to plug in so your OS will be activated and good to go.