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There is nothing that is related to virus in this problem, the volume control keys on the key board are extra keys which are usually found to malfunction over a period of time.
Also these keys depends on the fact whether the keyboard requires a driver to be installed for them, which depends on the brand of keyboard and whether you received a driver cd along with the keyboard to enable that functionality etc..
It could also happen that your operating system is not supporting the keys due to some driver update.
In your case it seems that the keys are not functioning due to a circuit damage which is normal for such keyboards with extra keys, Though many people won't do that would recommend you to change or replace the keyboard with a new one because of this reason,if it's under warranty.
Close down computer and reboot and pray. I mean to close down not reboot, not hibernate, not sleep.
Why? The electronic chips chatter before the operating system boots up. BIOS asks who is here? Any Keyboard, and other internal bits.
For readers... Cold rebooting fixes a multitude of problems with not working. OK, it does not fix everything, but it is a good first try
I recommend you look at the last function keys. F10 F11 or F12. They typically activate your 'number' pad for use. You'll need to depress the Fn key along with one of these other keys to activate or deactivate the combo
I had a similar problem with a new MS 4000 Keyboard. I found that I had two versions of the IntellPoint software on my Vista system. I uninstalled the older version (which came with my new computer) and the keyboard seems to be working well now. Check your system via the Control Panel, Install/Uninstall Programs and look for the MS IntellPoint software. Good luck.
try To download the latest drivers for the keyboard that you are using, visit the following Microsoft hardware Web site: http://www.microsoft.com/hardware/download/download.aspx?category=MK
If the issue occurs again, connect the keyboard to a different computer. If the keyboard functions correctly on a different computer, the port to which the keyboard was connected on the original computer may be damaged. If this is the case, contact your computer manufacturer to inquire about how to repair or replace the damaged port. If the keyboard does not function correctly on another computer, the keyboard may be defective. If this is the case, and the warranty on the keyboard is still valid, you can exchange the defective keyboard for a new keyboard.
I was just about to post that I have the same problem (keys not working on Y-RR54 except scroll, F Mode, etc.) But as I was posting, my keyboard started working. Here's how:
Keep your Y-RR54 connected and hook up another keyboard. WIth the other keyboard, go to Logitech.com and go to their Support section. Select your product (Keyboard and Mouse Combo -> LX700) and then go to Downloads. Download the latest Logitech Setpoint software and install it to your machine. Make sure the Y-RR54 is connected to the receiver before you install. The latest version as of this message is 4.70.213. Let it go through the install, and when you get to the program, click "My Keyboard" and it will make you go through a "Secure Connection" process. After this process was over, my keyboard worked just fine. I'm typing from it right now.