Only using one processor on Mac Pro

I can't figure out how to tell the software to use the other 3 processors. (Only one lights up in the CPU panel out of the 4) I've searched and can't find any answers...
Mac Pro 10.4.10 with Logic Pro 8 & 5 gigs ram. Any help would be much appreciated!
JJ

Take a look at the first keyboard here:
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Relevant specs:
Windows 7 Ultimate x64
Multisim v11
AMD A4-3400
16GB RAM

Completely forgot this topic....
Is there a good reason why there is no multicore support? Multisim can certainly use it for simulating.
As for the CPU throttling, I found a batch that can increase/decrease the "minimum processor state"-setting and it works immediately, no reboot required.
@echo off
powercfg.exe -getactivescheme > "%userprofile%\appdata\~apo.tmp"
set /p v_currentscheme= <"%userprofile%\appdata\~apo.tmp"
set v_currentscheme=%v_currentscheme:~24,36%
del "%userprofile%\appdata\~apo.tmp"
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powercfg -s %v_currentscheme%
exit
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