Control key combination stopped working

I use [control]- and [control]+ on the number pad to zoom the text in and out.
For some reason, [control]+ on the number pad no longer works. It does, however, work using the number keys at the top of the keyboard.
I have tried starting Firefox with no extensions loaded ... no joy. I have tried creating a new profile under my user account ... no joy. I have system administrator privileges.
When I launch Firefox using the Full Administrator's account and password, all the keys work.
I'm using Firefox 22.0 on top of Windows XP Professional.

This is driving me nuts.
The key combination does not work in either Firefox or Adobe Reader when I'm logged in as myself (with Admin privileges). When I login as Administrator, I do not have the problem.
I had to reformat my computer and reinstall all software a couple of days ago due to another problem. Interestingly, until yesterday afternoon, the key combos worked in both my account and the Administrator account. Sometime yesterday afternoon while reinstalling all the software, I lost the key combo on only my account again.
I checked the registry on both my account and the Administrator account ... no difference ... no joy.
If this happens in both Firefox and Adobe Reader, it's gotta be because of one of the pieces of software that I installed yesterday afternoon ... right???
[quote]
Can you think of any external software that might have captured that combination globally for some purpose (e.g., screen recorder software hotkey to start a new capture)?
[/quote]
Oh, I don't use any screen captures or hotkeys. It must be something that I'm not aware of.
Thanks.

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Please read this whole message before doing anything.
I've tested these instructions only with the Safari web browser. If you use another browser, they may not work as described.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
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Sorry to hear of your problems. I would suggest that you try a reset of the BIOS just to rule out any hardware conflicts the system may have. Try this........
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http://support.lenovo.com/us/en/supportphonelist_alt1
Owner & Operator of the following:
● Lenovo Ideapad Z570 w/ Win 7 & Win 8.1 Dual Boot ● Lenovo Yoga 3 Pro w/ Windows 8.1 ● Toshiba A75-S206 w/ Win 7
● IBM Thinkpad T-23 w/ Win XP ● IBM Thinkpad T-22 w/ Win XP • As well as multiple desktops dual/triple booting XP, Vista and Win 7.
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★ Sorry, I don't answer questions via Private Messages. Posting in the appropriate forum is the best way to get assistance.

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This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

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