Keyboard problem?

This is kind of a strange problem I suppose. The problem is I play a lot of FPS games competitively. I need to be able to switch weapons and move without error on a consistant basis. The problem is that I can't press some key combos that require to press and hold 3 keys at a time. For example: I am holding "w" and "d", to move forward and strafe right at the same time. I hit "2" to get out my second weapon and it won't work unless I let go of one of the other two previously pressed and held buttons. Any suggestions? I have a Logitech Navigator keyboard that has been a great keyboard for quite some time. I have tried using both the standard Windows XP drivers, and the Logitech iTouch drivers, both have the same problem. Anyone have any input on this problem?

Specifications:
AMD Athlon XP 2800+ Barton
EpoX 8RDA nForce 2 Motherboard
1 GB Dual-Channel PC2700 DDR
ATI Radeon 9700 Pro
2 IBM 60 GB 7200 RPM Harddrives
Logitech Navigator Keyboard
Logitech mx510 Mouse

I'd like to learn more about this myself. I remember back a number of years I use to play a demo of Micro machines and I'd play multiplayer with friends and family all on my computer with 3 of us all sharing the same keyboard andonly occasionally would it occur that too many buttons were being pressed resulting in someone's key not responding. The limit had to of been something like 6 keys at a time or so. So that tells me that we had a much better keyboard back then then the one I have now which beeps when I press just 3 keys at the same time. And the beep annoys me more then the fact that the keys become unresponsive. I just want that beep to go away. Not all keyboards beep so I wonder if it can be tuned off.

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Canada
Asus A7N8X-X, Athelon XP 2500+ Barton,
Samsung 1gb DDR400, MSI GeforceFX5900 XT.
Aquamark=<b>36077</b> 3DMark03=<b>5322</b>

If you press and hold CTRL and ALT, and you press the DEL key, what happens?

Guess what, you can press and hold two keys and the third will work....


Spec:
Intel P4 2.4B
MSI 645E Max-U Mobo
1GB DDR333
R9600XT 128MB
SB Live 5.1
WD 60GB
Maxtor 120GB
LG DVD+-R/RW
WIN2K PRO SP4